Product available Ships today (order by 14:00)

MW 5x30 / N38 - cylindrical magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

cylindrical magnet

Catalog no 010088

GTIN/EAN: 5906301810872

5.00

Diameter Ø

5 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

4.42 g

Magnetization Direction

↑ axial

Load capacity

0.45 kg / 4.40 N

Magnetic Induction

616.32 mT / 6163 Gs

Coating

[NiCuNi] Nickel

product specifications »

3.57 ZŁ with VAT / pcs + price for transport

2.90 ZŁ net + 23% VAT / pcs

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Product card - MW 5x30 / N38 - cylindrical magnet

Specification / characteristics - MW 5x30 / N38 - cylindrical magnet

properties

properties	values
Cat. no.	010088
GTIN/EAN	5906301810872
Production/Distribution	Dhit sp. z o.o. ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin	Poland / China / Germany
Customs code	85059029
Diameter Ø	5 mm [±0,1 mm]
Height	30 mm [±0,1 mm]
Weight	4.42 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.45 kg / 4.40 N
Magnetic Induction ~ ?	616.32 mT / 6163 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 5x30 / N38 - cylindrical magnet

properties	values	units
remenance Br [min. - max.] ?	12.2-12.6	kGs
remenance Br [min. - max.] ?	1220-1260	mT
coercivity bHc ?	10.8-11.5	kOe
coercivity bHc ?	860-915	kA/m
actual internal force iHc	≥ 12	kOe
actual internal force iHc	≥ 955	kA/m
energy density [min. - max.] ?	36-38	BH max MGOe
energy density [min. - max.] ?	287-303	BH max KJ/m
max. temperature ?	≤ 80	°C

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

properties	values	units
Vickers hardness	≥550	Hv
Density	≥7.4	g/cm³
Curie Temperature TC	312 - 380	°C
Curie Temperature TF	593 - 716	°F
Specific resistance	150	μΩ⋅cm
Bending strength	250	MPa
Compressive strength	1000~1100	MPa
Thermal expansion parallel (∥) to orientation (M)	(3-4) x 10^-6	°C^-1
Thermal expansion perpendicular (⊥) to orientation (M)	-(1-3) x 10^-6	°C^-1
Young's modulus	1.7 x 10⁴	kg/mm²

Engineering analysis of the assembly - data

Presented values are the outcome of a engineering simulation. Values are based on models for the material Nd₂Fe₁₄B. Real-world conditions might slightly deviate from the simulation results. Use these data as a reference point when designing systems.

Table 1: Static force (force vs distance) - interaction chart
MW 5x30 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	6154 Gs 615.4 mT	0.45 kg / 450.0 g 4.4 N	weak grip
1 mm	3877 Gs 387.7 mT	0.18 kg / 178.6 g 1.8 N	weak grip
2 mm	2308 Gs 230.8 mT	0.06 kg / 63.3 g 0.6 N	weak grip
3 mm	1419 Gs 141.9 mT	0.02 kg / 23.9 g 0.2 N	weak grip
5 mm	639 Gs 63.9 mT	0.00 kg / 4.8 g 0.0 N	weak grip
10 mm	173 Gs 17.3 mT	0.00 kg / 0.4 g 0.0 N	weak grip
15 mm	75 Gs 7.5 mT	0.00 kg / 0.1 g 0.0 N	weak grip
20 mm	40 Gs 4.0 mT	0.00 kg / 0.0 g 0.0 N	weak grip
30 mm	16 Gs 1.6 mT	0.00 kg / 0.0 g 0.0 N	weak grip
50 mm	5 Gs 0.5 mT	0.00 kg / 0.0 g 0.0 N	weak grip

Magnetic force decreases drastically with every subsequent millimeter of distance. Note that even a very thin break (e.g., contamination, paint, veneer) strongly weakens the grip. Magnetic products work optimally at the point of direct contact; air break nullifies the power. Observe how flashily the load capacity fall, when the product does not touch flatly to the steel surface. When designing the mounting, avoid additional spacers.

Table 2: Sliding force (vertical surface)
MW 5x30 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.09 kg / 90.0 g 0.9 N
1 mm	Stal (~0.2)	0.04 kg / 36.0 g 0.4 N
2 mm	Stal (~0.2)	0.01 kg / 12.0 g 0.1 N
3 mm	Stal (~0.2)	0.00 kg / 4.0 g 0.0 N
5 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
10 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
15 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

This section defines the theoretical weight limit required to cause the downward movement of the magnet downwards against a vertical steel wall (assuming typical friction coefficient). The holding force depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 5x30 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.14 kg / 135.0 g 1.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.09 kg / 90.0 g 0.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.05 kg / 45.0 g 0.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.23 kg / 225.0 g 2.2 N

When mounting a magnet on a upright wall (e.g., a fridge), it you can count on just approx. 20%-30% of its nominal power. Gravity and a low friction coefficient influence the fact that magnets slide down faster than they detach. Designing a wall mount? Note that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the magnet will give way down under a much lighter weight. Utilizing a rubberized coating can drastically improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MW 5x30 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.05 kg / 45.0 g 0.4 N
1 mm	25%	0.11 kg / 112.5 g 1.1 N
2 mm	50%	0.23 kg / 225.0 g 2.2 N
5 mm	100%	0.45 kg / 450.0 g 4.4 N
10 mm	100%	0.45 kg / 450.0 g 4.4 N

A thin sheet is unable to conduct the entire magnetic field, which wastes potential of the magnet. If you attach a powerful product to a weak sheet, the magnetism will pass right through and the holding will be smaller. To achieve 100% of this neodymium's power, you require a sufficiently solid backing of steel. The material oversaturation means that on delicate walls (e.g., thin profiles), the magnet works worse. We advise picking the steel thickness from these parameters.

Table 5: Working in heat (stability) - thermal limit
MW 5x30 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.45 kg / 450.0 g 4.4 N	OK
40 °C	-2.2%	0.44 kg / 440.1 g 4.3 N	OK
60 °C	-4.4%	0.43 kg / 430.2 g 4.2 N	OK
80 °C	-6.6%	0.42 kg / 420.3 g 4.1 N
100 °C	-28.8%	0.32 kg / 320.4 g 3.1 N

Classic neodymiums change their properties strength above the temperature limit. Avoid high temperatures – excessive heat can irreversibly demagnetize this product. With increasing heat, the neodymium's capacity temporarily decreases. Do not use this product close to ovens higher than its working range. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.

*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization sooner than long magnets. The danger warning in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MW 5x30 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	4.58 kg / 4584 g 45.0 N 6 170 Gs	N/A
1 mm	2.98 kg / 2982 g 29.3 N 9 927 Gs	2.68 kg / 2684 g 26.3 N ~0 Gs
2 mm	1.82 kg / 1820 g 17.9 N 7 755 Gs	1.64 kg / 1638 g 16.1 N ~0 Gs
3 mm	1.08 kg / 1083 g 10.6 N 5 981 Gs	0.97 kg / 974 g 9.6 N ~0 Gs
5 mm	0.39 kg / 391 g 3.8 N 3 595 Gs	0.35 kg / 352 g 3.5 N ~0 Gs
10 mm	0.05 kg / 49 g 0.5 N 1 278 Gs	0.04 kg / 44 g 0.4 N ~0 Gs
20 mm	0.00 kg / 4 g 0.0 N 346 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 49 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two strong neodymiums attract each other from a much further distance than a magnet and sheet combination. Such a system of two magnets produces a massive flux and a wider radius of performance. Want to build a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Remember that when bringing together two magnets, the impact force is extreme. The levitation is a bit weaker than the connection force, but still impressive.
*The magnetic induction between like poles drops to ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).

Table 7: Hazards (implants) - precautionary measures
MW 5x30 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	5.0 cm
Hearing aid	10 Gs (1.0 mT)	4.0 cm
Timepiece	20 Gs (2.0 mT)	3.0 cm
Mobile device	40 Gs (4.0 mT)	2.5 cm
Remote	50 Gs (5.0 mT)	2.0 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Powerful magnet radiation poses a large risk to electronic devices as well as medical implants. These NdFeB products produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and plastic. Exceptional care must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MW 5x30 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	10.18 km/h (2.83 m/s)	0.02 J
30 mm	17.63 km/h (4.90 m/s)	0.05 J
50 mm	22.75 km/h (6.32 m/s)	0.09 J
100 mm	32.18 km/h (8.94 m/s)	0.18 J

Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can trigger coating fragments or painful pinches to skin. Be sure to control the product during installation so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Anti-corrosion coating durability
MW 5x30 / N38

Technical parameter	Value / Description
Coating type	[NiCuNi] Nickel
Layer structure	Nickel - Copper - Nickel
Layer thickness	10-20 µm
Salt spray test (SST) ?	24 h
Recommended environment	Indoors only (dry)

The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Construction data (P_c)
MW 5x30 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	1 468 Mx	14.7 µWb
P_c Coefficient	1.59	High (Stable)

Flux value passing through the magnet pole. Key data for generator designers and motors. The P_c coefficient defines the working geometry.

Table 11: Physics of underwater searching
MW 5x30 / N38

Environment	Effective steel pull	Effect
Air (land)	0.45 kg	Standard
Water (riverbed)	0.52 kg (+0.07 kg Buoyancy gain)	+14.5%

Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Sliding resistance

*Note: On a vertical wall, the magnet retains merely a fraction of its max power.

2. Steel thickness impact

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Thermal stability

*For standard magnets, the max working temp is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 1.59

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The P_c (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher P_c value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical specification and ecology

Material specification

iron (Fe)	64% – 68%
neodymium (Nd)	29% – 32%
boron (B)	1.1% – 1.2%
dysprosium (Dy)	0.5% – 2.0%
coating (Ni-Cu-Ni)	< 0.05%

Ecology and recycling (GPSR)

recyclability (EoL)	100%
recycled raw materials	~10% (pre-cons)
carbon footprint	low / zredukowany
waste code (EWC)	16 02 16

Safety card (GPSR)

responsible entity

Dhit sp. z o.o.

ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki

tel: +48 22 499 98 98 | e-mail: bok@dhit.pl

batch number/type

id: 010088-2025

Magnet Unit Converter

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Kilograms (kg)

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Gauss (Gs)

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Insert data in one of the inputs, and all other values will recalculate automatically.

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The presented product is an exceptionally strong rod magnet, composed of advanced NdFeB material, which, with dimensions of Ø5x30 mm, guarantees maximum efficiency. The MW 5x30 / N38 model is characterized by high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 0.45 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.

This model is perfect for building generators, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 4.40 N with a weight of only 4.42 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.

Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.

Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø5x30), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.

This model is characterized by dimensions Ø5x30 mm, which, at a weight of 4.42 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 0.45 kg (force ~4.40 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.

Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 5 mm. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Pros as well as cons of Nd₂Fe₁₄B magnets.

Strengths

Besides their remarkable strength, neodymium magnets offer the following advantages:

They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
They have excellent resistance to magnetism drop due to external magnetic sources,
A magnet with a smooth gold surface looks better,
Magnetic induction on the working layer of the magnet turns out to be extremely intense,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
Possibility of accurate machining as well as modifying to individual needs,
Versatile presence in modern industrial fields – they serve a role in hard drives, brushless drives, medical equipment, as well as other advanced devices.
Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Cons

Problematic aspects of neodymium magnets and proposals for their use:

Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Limited ability of creating threads in the magnet and complicated forms - preferred is a housing - magnetic holder.
Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what it depends on?

The load parameter shown represents the maximum value, obtained under laboratory conditions, specifically:

using a plate made of mild steel, functioning as a magnetic yoke
with a thickness minimum 10 mm
with a surface cleaned and smooth
without any clearance between the magnet and steel
for force acting at a right angle (pull-off, not shear)
in neutral thermal conditions

Determinants of practical lifting force of a magnet

It is worth knowing that the working load may be lower influenced by the following factors, starting with the most relevant:

Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the holding force.

H&S for magnets

Nickel coating and allergies

Studies show that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, prevent touching magnets with bare hands and select versions in plastic housing.

Warning for heart patients

Warning for patients: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Powerful field

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Protective goggles

NdFeB magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets leads to them shattering into shards.

Crushing force

Pinching hazard: The attraction force is so great that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Magnetic interference

Remember: neodymium magnets generate a field that confuses sensitive sensors. Keep a separation from your phone, device, and GPS.

Dust is flammable

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Magnetic media

Intense magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Product not for children

Neodymium magnets are not suitable for play. Swallowing several magnets can lead to them pinching intestinal walls, which poses a critical condition and necessitates immediate surgery.

Operating temperature

Control the heat. Heating the magnet to high heat will destroy its properties and strength.

Caution! Need more info? Read our article: Why are neodymium magnets dangerous?

MW 5x30 / N38 - cylindrical magnet

Product card - MW 5x30 / N38 - cylindrical magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering analysis of the assembly - data

Table 1: Static force (force vs distance) - interaction chart MW 5x30 / N38

Table 2: Sliding force (vertical surface) MW 5x30 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MW 5x30 / N38

Table 4: Material efficiency (substrate influence) - power losses MW 5x30 / N38

Table 5: Working in heat (stability) - thermal limit MW 5x30 / N38

Table 6: Two magnets (repulsion) - forces in the system MW 5x30 / N38

Table 7: Hazards (implants) - precautionary measures MW 5x30 / N38

Table 8: Collisions (kinetic energy) - collision effects MW 5x30 / N38

Table 9: Anti-corrosion coating durability MW 5x30 / N38

Table 10: Construction data (Pc) MW 5x30 / N38

Table 11: Physics of underwater searching MW 5x30 / N38

1. Sliding resistance

2. Steel thickness impact

3. Thermal stability

4. Demagnetization curve and operating point (B-H)

Material specification

Ecology and recycling (GPSR)

Pulling force

Magnetic Induction

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MW 18x10 / N38 - cylindrical magnet

UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

SM 32x475 [2xM8] / N42 - magnetic separator

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Cons

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what it depends on?

Determinants of practical lifting force of a magnet

H&S for magnets

Nickel coating and allergies

Warning for heart patients

Powerful field

Protective goggles

Crushing force

Magnetic interference

Dust is flammable

Magnetic media

Product not for children

Operating temperature

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (force vs distance) - interaction chart
MW 5x30 / N38

Table 2: Sliding force (vertical surface)
MW 5x30 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 5x30 / N38

Table 4: Material efficiency (substrate influence) - power losses
MW 5x30 / N38

Table 5: Working in heat (stability) - thermal limit
MW 5x30 / N38

Table 6: Two magnets (repulsion) - forces in the system
MW 5x30 / N38

Table 7: Hazards (implants) - precautionary measures
MW 5x30 / N38

Table 8: Collisions (kinetic energy) - collision effects
MW 5x30 / N38

Table 9: Anti-corrosion coating durability
MW 5x30 / N38

Table 10: Construction data (P_c)
MW 5x30 / N38

Table 11: Physics of underwater searching
MW 5x30 / N38

Pros as well as cons of Nd₂Fe₁₄B magnets.