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MW 5x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010089

GTIN/EAN: 5906301810889

5.00

Diameter Ø

5 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

0.59 g

Magnetization Direction

↑ axial

Load capacity

0.84 kg / 8.24 N

Magnetic Induction

524.45 mT / 5244 Gs

Coating

[NiCuNi] Nickel

check technical data »

0.369 ZŁ with VAT / pcs + price for transport

0.300 ZŁ net + 23% VAT / pcs

bulk discounts:

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Strength as well as appearance of a neodymium magnet can be checked on our modular calculator.

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Technical - MW 5x4 / N38 - cylindrical magnet

Specification / characteristics - MW 5x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010089
GTIN/EAN 5906301810889
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 4 mm [±0,1 mm]
Weight 0.59 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.84 kg / 8.24 N
Magnetic Induction ~ ? 524.45 mT / 5244 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 5x4 / 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

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 magnet - technical parameters

Presented information constitute the direct effect of a mathematical analysis. Results rely on algorithms for the class Nd2Fe14B. Operational conditions might slightly differ. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs gap) - interaction chart
MW 5x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5236 Gs
523.6 mT
 0.84 kg / 1.85 lbs
840.0 g / 8.2 N
 weak grip
1 mm 3243 Gs
324.3 mT
 0.32 kg / 0.71 lbs
322.1 g / 3.2 N
 weak grip
2 mm 1850 Gs
185.0 mT
 0.10 kg / 0.23 lbs
104.8 g / 1.0 N
 weak grip
3 mm 1076 Gs
107.6 mT
 0.04 kg / 0.08 lbs
35.5 g / 0.3 N
 weak grip
5 mm 428 Gs
42.8 mT
 0.01 kg / 0.01 lbs
5.6 g / 0.1 N
 weak grip
10 mm 89 Gs
8.9 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 weak grip
15 mm 31 Gs
3.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
20 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Grip strength decreases drastically with every subsequent millimeter of distance. Note that even a microscopic distance (e.g., dirt, varnish, veneer) noticeably diminishes the holding power. Magnetic products hold most effectively at the point of direct contact; air break kills the force. Observe how quickly the parameters plummet, when the product does not touch tightly to the metal substrate. When calculating the assembly, discard redundant distances.

Table 2: Vertical hold (wall)
MW 5x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.17 kg / 0.37 lbs
168.0 g / 1.6 N
1 mm Stal (~0.2) 0.06 kg / 0.14 lbs
64.0 g / 0.6 N
2 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
3 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
5 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
This section calculates the theoretical shear load necessary to initiate the downward movement of the magnet downwards against a vertical metal surface (assuming typical friction). This value varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MW 5x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.25 kg / 0.56 lbs
252.0 g / 2.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.17 kg / 0.37 lbs
168.0 g / 1.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.08 kg / 0.19 lbs
84.0 g / 0.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.42 kg / 0.93 lbs
420.0 g / 4.1 N
When placing a holder on a upright plane (e.g., a board), it you can count on just approx. 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient mean that holders slide down faster than they pop off the substrate. Want to create a wall mount? Consider that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the holder will give way down under a significantly smaller weight. Application of an anti-slip coating can effectively increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 5x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
1 mm
25%
 0.21 kg / 0.46 lbs
210.0 g / 2.1 N
2 mm
50%
 0.42 kg / 0.93 lbs
420.0 g / 4.1 N
3 mm
75%
 0.63 kg / 1.39 lbs
630.0 g / 6.2 N
5 mm
100%
 0.84 kg / 1.85 lbs
840.0 g / 8.2 N
10 mm
100%
 0.84 kg / 1.85 lbs
840.0 g / 8.2 N
11 mm
100%
 0.84 kg / 1.85 lbs
840.0 g / 8.2 N
12 mm
100%
 0.84 kg / 1.85 lbs
840.0 g / 8.2 N
A thin metal plate is incapable of conduct the full magnetic flux, which weakens actual performance of the magnet. If you install a neodymium to a weak sheet, the flux will pass right through and the holding will be smaller. To achieve the maximum of this neodymium's power, you need a suitably thick element of steel. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the magnet holds weaker. We advise picking the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MW 5x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.84 kg / 1.85 lbs
840.0 g / 8.2 N
 OK
40 °C -2.2% 0.82 kg / 1.81 lbs
821.5 g / 8.1 N
 OK
60 °C -4.4% 0.80 kg / 1.77 lbs
803.0 g / 7.9 N
 OK
80 °C -6.6% 0.78 kg / 1.73 lbs
784.6 g / 7.7 N
100 °C -28.8% 0.60 kg / 1.32 lbs
598.1 g / 5.9 N
Classic neodymiums change their properties power above the temperature limit. Protect against heat – excessive heat can irreversibly demagnetize this magnet. With every degree above norm, the magnet's power momentarily drops. Avoid using this magnet in hot environments exceeding its working range. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Thin magnets (low Pc) risk losing magnetic properties sooner than taller cylinders. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 5x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.32 kg / 7.32 lbs
5 894 Gs
0.50 kg / 1.10 lbs
498 g / 4.9 N
 N/A
1 mm 2.14 kg / 4.72 lbs
8 408 Gs
0.32 kg / 0.71 lbs
321 g / 3.1 N
 1.93 kg / 4.24 lbs
~0 Gs
2 mm 1.27 kg / 2.81 lbs
6 486 Gs
0.19 kg / 0.42 lbs
191 g / 1.9 N
 1.15 kg / 2.53 lbs
~0 Gs
3 mm 0.73 kg / 1.61 lbs
4 909 Gs
0.11 kg / 0.24 lbs
109 g / 1.1 N
 0.66 kg / 1.45 lbs
~0 Gs
5 mm 0.24 kg / 0.53 lbs
2 805 Gs
0.04 kg / 0.08 lbs
36 g / 0.4 N
 0.21 kg / 0.47 lbs
~0 Gs
10 mm 0.02 kg / 0.05 lbs
857 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
20 mm 0.00 kg / 0.00 lbs
177 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
16 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
9 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
6 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
4 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
3 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
2 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products attract each other from a much further distance than a magnet and steel combination. The setup of two magnets generates a stronger field and a further horizon of performance. Want to build a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the collision energy is extreme. The repulsion force is marginally weaker than the connection force, but still large.
*Field value for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Important: Calculations apply to friction force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - precautionary measures
MW 5x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.0 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Timepiece 20 Gs (2.0 mT) 2.0 cm
Mobile device 40 Gs (4.0 mT) 1.5 cm
Remote 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
A strong magnetic field poses a real danger to electronic devices as well as pacemakers. These neodymiums generate a flux that prevents correct functioning of digital equipment. Remember: the invisible magnetic field passes through tissues and housings. Exceptional care must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MW 5x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 38.06 km/h
(10.57 m/s)
 0.03 J
30 mm 65.91 km/h
(18.31 m/s)
 0.10 J
50 mm 85.09 km/h
(23.64 m/s)
 0.16 J
100 mm 120.34 km/h
(33.43 m/s)
 0.33 J
Neodymium magnets are delicate – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can destroy the magnet or dangerous crushing to fingers. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when playing with large magnets.

Table 9: Anti-corrosion coating durability
MW 5x4 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 5x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 046 Mx 10.5 µWb
Pc Coefficient 0.79 High (Stable)
Total magnetic flux emitted by the magnet pole. Key data when building generators as well as sensors. Pc value determines the working geometry.

Table 11: Underwater work (magnet fishing)
MW 5x4 / N38

Environment Effective steel pull Effect
Air (land) 0.84 kg Standard
Water (riverbed) 0.96 kg
(+0.12 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 surface, the magnet retains only a fraction of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly reduces the holding force.

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.79

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 Pc (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 Pc 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: 010089-2026
Quick Unit Converter
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This product is an extremely powerful rod magnet, made from modern NdFeB material, which, with dimensions of Ø5x4 mm, guarantees maximum efficiency. The MW 5x4 / N38 component features high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 0.84 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 8.24 N with a weight of only 0.59 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 5.1 mm) using epoxy glues. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are suitable for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø5x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø5x4 mm, which, at a weight of 0.59 g, makes it an element with impressive magnetic energy density. The value of 8.24 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.59 g. 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 most desirable 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 through the diameter if your project requires it.

Advantages and disadvantages of rare earth magnets.

Advantages

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • They retain full power for nearly ten years – the loss is just ~1% (according to analyses),
  • They show high resistance to demagnetization induced by external field influence,
  • Thanks to the shiny finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an modern appearance,
  • They show high magnetic induction at the operating surface, making them more effective,
  • 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 possibility of flexible molding and customization to custom projects, NdFeB magnets can be created in a variety of geometric configurations, which expands the range of possible applications,
  • Fundamental importance in modern industrial fields – they are used in hard drives, electric drive systems, medical devices, as well as complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Limited possibility of creating threads in the magnet and complicated forms - preferred is cover - magnet mounting.
  • Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • With large orders the cost of neodymium magnets is economically unviable,

Holding force characteristics

Highest magnetic holding force – what it depends on?

The lifting capacity listed is a result of laboratory testing performed under the following configuration:
  • using a sheet made of low-carbon steel, acting as a magnetic yoke
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with an ground contact surface
  • under conditions of ideal adhesion (metal-to-metal)
  • during pulling in a direction perpendicular to the plane
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

During everyday use, the actual lifting capacity is determined by many variables, listed from crucial:
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the flux to be escaped to the other side.
  • Steel type – mild steel attracts best. Alloy steels decrease magnetic permeability and holding force.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate decreases the holding force.

H&S for magnets
Keep away from electronics

Navigation devices and mobile phones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Danger to pacemakers

People with a ICD should maintain an safe separation from magnets. The magnetism can interfere with the functioning of the life-saving device.

Protect data

Avoid bringing magnets near a purse, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.

Allergic reactions

Medical facts indicate that nickel (the usual finish) is a potent allergen. If you have an allergy, avoid direct skin contact and select coated magnets.

Combustion hazard

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

Permanent damage

Avoid heat. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).

Magnets are brittle

Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Danger to the youngest

Strictly keep magnets away from children. Risk of swallowing is high, and the effects of magnets connecting inside the body are fatal.

Physical harm

Large magnets can break fingers instantly. Under no circumstances place your hand betwixt two strong magnets.

Caution required

Before starting, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Danger! Need more info? Check our post: Why are neodymium magnets dangerous?