Product available Ships tomorrow

MPL 50x50x10 / N38 - lamellar 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

lamellar magnet

Catalog no 020167

GTIN/EAN: 5906301811732

5.00

length

50 mm [±0,1 mm]

Width

50 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

187.5 g

Magnetization Direction

↑ axial

Load capacity

33.73 kg / 330.92 N

Magnetic Induction

209.75 mT / 2097 Gs

Coating

[NiCuNi] Nickel

check parameters »

42.88 ZŁ with VAT / pcs + price for transport

34.86 ZŁ net + 23% VAT / pcs

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Technical details - MPL 50x50x10 / N38 - lamellar magnet

Specification / characteristics - MPL 50x50x10 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020167
GTIN/EAN	5906301811732
Production/Distribution	Dhit sp. z o.o. ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin	Poland / China / Germany
Customs code	85059029
length	50 mm [±0,1 mm]
Width	50 mm [±0,1 mm]
Height	10 mm [±0,1 mm]
Weight	187.5 g
Magnetization Direction	↑ axial
Load capacity ~ ?	33.73 kg / 330.92 N
Magnetic Induction ~ ?	209.75 mT / 2097 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x50x10 / N38 - lamellar 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

Physical simulation of the product - report

The following data are the outcome of a engineering simulation. Results were calculated on models for the material Nd₂Fe₁₄B. Actual parameters might slightly differ from theoretical values. Please consider these data as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - interaction chart
MPL 50x50x10 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2097 Gs 209.7 mT	33.73 kg / 33730.0 g 330.9 N	critical level
1 mm	2056 Gs 205.6 mT	32.43 kg / 32430.0 g 318.1 N	critical level
2 mm	2009 Gs 200.9 mT	30.96 kg / 30964.6 g 303.8 N	critical level
3 mm	1957 Gs 195.7 mT	29.38 kg / 29380.4 g 288.2 N	critical level
5 mm	1841 Gs 184.1 mT	25.99 kg / 25992.3 g 255.0 N	critical level
10 mm	1514 Gs 151.4 mT	17.58 kg / 17577.6 g 172.4 N	critical level
15 mm	1194 Gs 119.4 mT	10.93 kg / 10931.8 g 107.2 N	critical level
20 mm	922 Gs 92.2 mT	6.51 kg / 6512.2 g 63.9 N	warning
30 mm	543 Gs 54.3 mT	2.26 kg / 2260.0 g 22.2 N	warning
50 mm	209 Gs 20.9 mT	0.33 kg / 334.1 g 3.3 N	low risk

Grip strength weakens drastically with every subsequent millimeter of distance. Remember that even the smallest gap (e.g., contamination, varnish, rust) noticeably diminishes the holding power. Neodymiums work optimally during direct contact; distance weakens the force. See how rapidly the pull force plummet, when the magnet does not adhere tightly to the steel surface. When planning the assembly, eliminate redundant distances.

Table 2: Vertical capacity (vertical surface)
MPL 50x50x10 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	6.75 kg / 6746.0 g 66.2 N
1 mm	Stal (~0.2)	6.49 kg / 6486.0 g 63.6 N
2 mm	Stal (~0.2)	6.19 kg / 6192.0 g 60.7 N
3 mm	Stal (~0.2)	5.88 kg / 5876.0 g 57.6 N
5 mm	Stal (~0.2)	5.20 kg / 5198.0 g 51.0 N
10 mm	Stal (~0.2)	3.52 kg / 3516.0 g 34.5 N
15 mm	Stal (~0.2)	2.19 kg / 2186.0 g 21.4 N
20 mm	Stal (~0.2)	1.30 kg / 1302.0 g 12.8 N
30 mm	Stal (~0.2)	0.45 kg / 452.0 g 4.4 N
50 mm	Stal (~0.2)	0.07 kg / 66.0 g 0.6 N

The following data shows the approximate shear load sufficient to cause the shifting of the magnet down against a upright steel plate (considering standard friction). This parameter depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 50x50x10 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	10.12 kg / 10119.0 g 99.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	6.75 kg / 6746.0 g 66.2 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	3.37 kg / 3373.0 g 33.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	16.87 kg / 16865.0 g 165.4 N

When placing a magnet on a upright wall (e.g., a board), it will only hold only about 1/5 of nominal attraction strength. Gravity and a low friction coefficient mean that magnets slide down faster than they pull off. Planning a hanger? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the element will slip down under a much lighter load. Utilizing a rubberized layer can effectively improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 50x50x10 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	1.69 kg / 1686.5 g 16.5 N
1 mm	13%	4.22 kg / 4216.3 g 41.4 N
2 mm	25%	8.43 kg / 8432.5 g 82.7 N
5 mm	63%	21.08 kg / 21081.2 g 206.8 N
10 mm	100%	33.73 kg / 33730.0 g 330.9 N

A thin sheet is not enough to take in the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's potential, you need a suitably thick backing of metal. The saturation phenomenon causes that on sheet metal structures (e.g., car bodies), the holder holds weaker. We advise picking the steel dimension from these parameters.

Table 5: Thermal resistance (stability) - power drop
MPL 50x50x10 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	33.73 kg / 33730.0 g 330.9 N	OK
40 °C	-2.2%	32.99 kg / 32987.9 g 323.6 N	OK
60 °C	-4.4%	32.25 kg / 32245.9 g 316.3 N
80 °C	-6.6%	31.50 kg / 31503.8 g 309.1 N
100 °C	-28.8%	24.02 kg / 24015.8 g 235.6 N

Standard neodymium magnets change their properties power above the temperature limit. Protect against heat – excessive heat can permanently demagnetize this magnet. With increasing heat, the neodymium's capacity temporarily lowers. Do not use this magnet close to ovens higher than its working range. Exceeding the critical threshold will lead to destruction of magnetism.

*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) risk losing magnetic properties sooner compared to rod magnets. Red status in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field collision
MPL 50x50x10 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	67.80 kg / 67795 g 665.1 N 3 611 Gs	N/A
1 mm	66.54 kg / 66544 g 652.8 N 4 156 Gs	59.89 kg / 59889 g 587.5 N ~0 Gs
2 mm	65.18 kg / 65182 g 639.4 N 4 113 Gs	58.66 kg / 58664 g 575.5 N ~0 Gs
3 mm	63.74 kg / 63744 g 625.3 N 4 067 Gs	57.37 kg / 57369 g 562.8 N ~0 Gs
5 mm	60.67 kg / 60670 g 595.2 N 3 968 Gs	54.60 kg / 54603 g 535.7 N ~0 Gs
10 mm	52.24 kg / 52243 g 512.5 N 3 682 Gs	47.02 kg / 47019 g 461.3 N ~0 Gs
20 mm	35.33 kg / 35330 g 346.6 N 3 028 Gs	31.80 kg / 31797 g 311.9 N ~0 Gs
50 mm	7.69 kg / 7692 g 75.5 N 1 413 Gs	6.92 kg / 6923 g 67.9 N ~0 Gs

Two magnetic products attract each other from a significantly greater distance than a magnet and steel setup. The setup of two magnets generates a stronger field and a wider radius of operation. Want to build a solid fastener? Apply two magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the collision energy is massive. The levitation is marginally weaker than the connection force, but still significant.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).

Table 7: Hazards (implants) - precautionary measures
MPL 50x50x10 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	21.0 cm
Hearing aid	10 Gs (1.0 mT)	16.5 cm
Mechanical watch	20 Gs (2.0 mT)	13.0 cm
Mobile device	40 Gs (4.0 mT)	10.0 cm
Remote	50 Gs (5.0 mT)	9.5 cm
Payment card	400 Gs (40.0 mT)	4.0 cm
HDD hard drive	600 Gs (60.0 mT)	3.0 cm

A strong magnetic field poses a large risk to electronics as well as pacemakers. These magnets produce a field that destroys function of digital equipment. Be aware: the invisible magnetic field passes through tissues and housings. Special caution must be exercised by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MPL 50x50x10 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	17.38 km/h (4.83 m/s)	2.19 J
30 mm	24.39 km/h (6.78 m/s)	4.30 J
50 mm	30.43 km/h (8.45 m/s)	6.70 J
100 mm	42.78 km/h (11.88 m/s)	13.24 J

NdFeB products are very brittle – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely becomes dangerous. Striking energy can trigger coating fragments or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't hit violently against the metal. A collision at high speed means shattering of the magnet. Use safety goggles when working with powerful specimens.

Table 9: Coating parameters (durability)
MPL 50x50x10 / 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)

Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MPL 50x50x10 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	61 501 Mx	615.0 µWb
P_c Coefficient	0.26	Low (Flat)

Flux value passing through the magnet pole. Essential parameter in coil applications as well as sensors. P_c value determines the working geometry.

Table 11: Physics of underwater searching
MPL 50x50x10 / N38

Environment	Effective steel pull	Effect
Air (land)	33.73 kg	Standard
Water (riverbed)	38.62 kg (+4.89 kg Buoyancy gain)	+14.5%

Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Heat tolerance

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.26

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.

Engineering data and GPSR

Elemental analysis

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: 020167-2025

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Component MPL 50x50x10 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 33.73 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.

The key to success is sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 50x50x10 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Using a screwdriver risks destroying the coating and permanently cracking the magnet.

Plate magnets MPL 50x50x10 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 33.73 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.

Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.

The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.

The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 50 mm (width), and 10 mm (thickness). It is a magnetic block with dimensions 50x50x10 mm and a self-weight of 187.5 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of Nd₂Fe₁₄B magnets.

Benefits

Apart from their consistent holding force, neodymium magnets have these key benefits:

Their strength is maintained, and after approximately 10 years it drops only by ~1% (according to research),
They retain their magnetic properties even under close interference source,
In other words, due to the glossy finish of silver, the element gains a professional look,
They are known for high magnetic induction at the operating surface, which affects their effectiveness,
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...
Considering the option of accurate forming and adaptation to specialized needs, neodymium magnets can be modeled in a wide range of shapes and sizes, which expands the range of possible applications,
Huge importance in future technologies – they are used in data components, drive modules, advanced medical instruments, and other advanced devices.
Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Weaknesses

Disadvantages of neodymium magnets:

They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
Due to limitations in realizing threads and complicated shapes in magnets, we recommend using a housing - magnetic mechanism.
Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small components of these devices are able to complicate diagnosis medical in case of swallowing.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

Information about lifting capacity was determined for the most favorable conditions, assuming:

with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
with a cross-section minimum 10 mm
characterized by smoothness
with zero gap (no coatings)
during pulling in a direction perpendicular to the plane
at conditions approx. 20°C

Practical aspects of lifting capacity – factors

During everyday use, the actual holding force depends on many variables, listed from the most important:

Distance – the presence of any layer (rust, tape, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
Chemical composition of the base – mild steel gives the best results. Alloy steels lower magnetic permeability and lifting capacity.
Surface finish – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with neodymium magnets

Nickel coating and allergies

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop working with magnets and wear gloves.

Medical interference

For implant holders: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Safe operation

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

Magnetic interference

An intense magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Maintain magnets near a device to avoid breaking the sensors.

Do not overheat magnets

Regular neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. This process is irreversible.

Magnet fragility

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets leads to them shattering into shards.

Fire risk

Powder created during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Bodily injuries

Big blocks can smash fingers instantly. Under no circumstances put your hand between two strong magnets.

Swallowing risk

Neodymium magnets are not toys. Eating several magnets may result in them attracting across intestines, which constitutes a severe health hazard and necessitates urgent medical intervention.

Keep away from computers

Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Attention! Want to know more? Read our article: Why are neodymium magnets dangerous?

MPL 50x50x10 / N38 - lamellar magnet

Technical details - MPL 50x50x10 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the product - report

Table 1: Static pull force (force vs distance) - interaction chart MPL 50x50x10 / N38

Table 2: Vertical capacity (vertical surface) MPL 50x50x10 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces MPL 50x50x10 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection MPL 50x50x10 / N38

Table 5: Thermal resistance (stability) - power drop MPL 50x50x10 / N38

Table 6: Two magnets (attraction) - field collision MPL 50x50x10 / N38

Table 7: Hazards (implants) - precautionary measures MPL 50x50x10 / N38

Table 8: Dynamics (cracking risk) - collision effects MPL 50x50x10 / N38

Table 9: Coating parameters (durability) MPL 50x50x10 / N38

Table 10: Electrical data (Flux) MPL 50x50x10 / N38

Table 11: Physics of underwater searching MPL 50x50x10 / N38

1. Vertical hold

2. Plate thickness effect

3. Heat tolerance

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

Elemental analysis

Ecology and recycling (GPSR)

Magnet pull force

Magnetic Field

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Pros and cons of Nd2Fe14B magnets.

Benefits

Weaknesses

Pull force analysis

Maximum lifting force for a neodymium magnet – what affects it?

Practical aspects of lifting capacity – factors

Precautions when working with neodymium magnets

Nickel coating and allergies

Medical interference

Safe operation

Magnetic interference

Do not overheat magnets

Magnet fragility

Fire risk

Bodily injuries

Swallowing risk

Keep away from computers

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs distance) - interaction chart
MPL 50x50x10 / N38

Table 2: Vertical capacity (vertical surface)
MPL 50x50x10 / N38

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 50x50x10 / N38

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 50x50x10 / N38

Table 5: Thermal resistance (stability) - power drop
MPL 50x50x10 / N38

Table 6: Two magnets (attraction) - field collision
MPL 50x50x10 / N38

Table 7: Hazards (implants) - precautionary measures
MPL 50x50x10 / N38

Table 8: Dynamics (cracking risk) - collision effects
MPL 50x50x10 / N38

Table 9: Coating parameters (durability)
MPL 50x50x10 / N38

Table 10: Electrical data (Flux)
MPL 50x50x10 / N38

Table 11: Physics of underwater searching
MPL 50x50x10 / N38

Pros and cons of Nd₂Fe₁₄B magnets.