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MPL 100x40x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020109

GTIN/EAN: 5906301811152

5.00

length

100 mm [±0,1 mm]

Width

40 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

600 g

Magnetization Direction

↑ axial

Load capacity

120.01 kg / 1177.33 N

Magnetic Induction

337.24 mT / 3372 Gs

Coating

[NiCuNi] Nickel

technical parameters »

335.30 ZŁ with VAT / pcs + price for transport

272.60 ZŁ net + 23% VAT / pcs

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Product card - MPL 100x40x20 / N38 - lamellar magnet

Specification / characteristics - MPL 100x40x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020109
GTIN/EAN 5906301811152
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 100 mm [±0,1 mm]
Width 40 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 600 g
Magnetization Direction ↑ axial
Load capacity ~ ? 120.01 kg / 1177.33 N
Magnetic Induction ~ ? 337.24 mT / 3372 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 100x40x20 / 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

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 modeling of the product - technical parameters

The following information represent the outcome of a engineering analysis. Values are based on algorithms for the material Nd2Fe14B. Operational conditions may differ. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs gap) - power drop
MPL 100x40x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3372 Gs
337.2 mT
 120.01 kg / 264.58 lbs
120010.0 g / 1177.3 N
 crushing
1 mm 3268 Gs
326.8 mT
 112.70 kg / 248.45 lbs
112695.4 g / 1105.5 N
 crushing
2 mm 3158 Gs
315.8 mT
 105.27 kg / 232.09 lbs
105272.6 g / 1032.7 N
 crushing
3 mm 3046 Gs
304.6 mT
 97.92 kg / 215.88 lbs
97921.3 g / 960.6 N
 crushing
5 mm 2818 Gs
281.8 mT
 83.78 kg / 184.71 lbs
83783.3 g / 821.9 N
 crushing
10 mm 2266 Gs
226.6 mT
 54.17 kg / 119.43 lbs
54174.5 g / 531.5 N
 crushing
15 mm 1794 Gs
179.4 mT
 33.96 kg / 74.86 lbs
33955.7 g / 333.1 N
 crushing
20 mm 1419 Gs
141.9 mT
 21.25 kg / 46.84 lbs
21248.1 g / 208.4 N
 crushing
30 mm 908 Gs
90.8 mT
 8.70 kg / 19.17 lbs
8696.3 g / 85.3 N
 warning
50 mm 416 Gs
41.6 mT
 1.83 kg / 4.02 lbs
1825.4 g / 17.9 N
 low risk
Pulling power weakens sharply per each millimeter of spacing. Keep in mind that even a microscopic distance (e.g., dirt, varnish, veneer) strongly diminishes the holding power. Magnets hold most effectively during direct contact; air break nullifies the power. Notice how quickly the load capacity fall, when the product does not touch flatly to the steel surface. When calculating the arrangement, avoid unnecessary gaps.

Table 2: Vertical capacity (vertical surface)
MPL 100x40x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 24.00 kg / 52.92 lbs
24002.0 g / 235.5 N
1 mm Stal (~0.2) 22.54 kg / 49.69 lbs
22540.0 g / 221.1 N
2 mm Stal (~0.2) 21.05 kg / 46.42 lbs
21054.0 g / 206.5 N
3 mm Stal (~0.2) 19.58 kg / 43.18 lbs
19584.0 g / 192.1 N
5 mm Stal (~0.2) 16.76 kg / 36.94 lbs
16756.0 g / 164.4 N
10 mm Stal (~0.2) 10.83 kg / 23.88 lbs
10834.0 g / 106.3 N
15 mm Stal (~0.2) 6.79 kg / 14.97 lbs
6792.0 g / 66.6 N
20 mm Stal (~0.2) 4.25 kg / 9.37 lbs
4250.0 g / 41.7 N
30 mm Stal (~0.2) 1.74 kg / 3.84 lbs
1740.0 g / 17.1 N
50 mm Stal (~0.2) 0.37 kg / 0.81 lbs
366.0 g / 3.6 N
The table below presents the estimated weight limit required to initiate the sliding of the magnet vertically along a vertical metal surface (assuming typical friction coefficient). This value depends on the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MPL 100x40x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
36.00 kg / 79.37 lbs
36003.0 g / 353.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
24.00 kg / 52.92 lbs
24002.0 g / 235.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
12.00 kg / 26.46 lbs
12001.0 g / 117.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
60.01 kg / 132.29 lbs
60005.0 g / 588.6 N
When placing a holder on a vertical surface (e.g., a fridge), it will only hold barely approx. 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that holders move down faster than they pop off the substrate. Designing a wall mount? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the element will slip down under a much lighter load. Using a rubber pad can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MPL 100x40x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 4.00 kg / 8.82 lbs
4000.3 g / 39.2 N
1 mm
8%
 10.00 kg / 22.05 lbs
10000.8 g / 98.1 N
2 mm
17%
 20.00 kg / 44.10 lbs
20001.7 g / 196.2 N
3 mm
25%
 30.00 kg / 66.14 lbs
30002.5 g / 294.3 N
5 mm
42%
 50.00 kg / 110.24 lbs
50004.2 g / 490.5 N
10 mm
83%
 100.01 kg / 220.48 lbs
100008.3 g / 981.1 N
11 mm
92%
 110.01 kg / 242.53 lbs
110009.2 g / 1079.2 N
12 mm
100%
 120.01 kg / 264.58 lbs
120010.0 g / 1177.3 N
A thin metal plate is unable to take in the entire magnetic field, which squanders power of the magnet. Should you mount a strong magnet to a too thin substrate, the magnetism will pass right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's power, you need a suitably thick backing of steel. The material oversaturation causes that on delicate walls (e.g., car bodies), the magnet works worse. We recommend selecting the steel thickness according to the table below.

Table 5: Working in heat (stability) - resistance threshold
MPL 100x40x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 120.01 kg / 264.58 lbs
120010.0 g / 1177.3 N
 OK
40 °C -2.2% 117.37 kg / 258.76 lbs
117369.8 g / 1151.4 N
 OK
60 °C -4.4% 114.73 kg / 252.94 lbs
114729.6 g / 1125.5 N
80 °C -6.6% 112.09 kg / 247.11 lbs
112089.3 g / 1099.6 N
100 °C -28.8% 85.45 kg / 188.38 lbs
85447.1 g / 838.2 N
Classic neodymiums lose strength past the thermal threshold. Watch out for overheating – excessive heat can irreversibly damage this product. With every degree above norm, the neodymium's capacity temporarily drops. Do not use this magnet close to heaters exceeding its operating temperature limit. Ignoring the limit will result in destruction of magnetism.
*Important note: Temperature resistance is determined by both grade, but also on the magnet's shape. Flat magnets (low Pc) may lose charge permanently sooner than taller cylinders. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 100x40x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 280.40 kg / 618.18 lbs
4 790 Gs
42.06 kg / 92.73 lbs
42060 g / 412.6 N
 N/A
1 mm 271.97 kg / 599.59 lbs
6 642 Gs
40.80 kg / 89.94 lbs
40796 g / 400.2 N
 244.77 kg / 539.63 lbs
~0 Gs
2 mm 263.31 kg / 580.50 lbs
6 535 Gs
39.50 kg / 87.08 lbs
39497 g / 387.5 N
 236.98 kg / 522.45 lbs
~0 Gs
3 mm 254.63 kg / 561.37 lbs
6 427 Gs
38.20 kg / 84.21 lbs
38195 g / 374.7 N
 229.17 kg / 505.24 lbs
~0 Gs
5 mm 237.35 kg / 523.26 lbs
6 205 Gs
35.60 kg / 78.49 lbs
35602 g / 349.3 N
 213.61 kg / 470.93 lbs
~0 Gs
10 mm 195.76 kg / 431.58 lbs
5 635 Gs
29.36 kg / 64.74 lbs
29364 g / 288.1 N
 176.18 kg / 388.42 lbs
~0 Gs
20 mm 126.58 kg / 279.06 lbs
4 531 Gs
18.99 kg / 41.86 lbs
18987 g / 186.3 N
 113.92 kg / 251.15 lbs
~0 Gs
50 mm 31.47 kg / 69.38 lbs
2 259 Gs
4.72 kg / 10.41 lbs
4721 g / 46.3 N
 28.32 kg / 62.44 lbs
~0 Gs
60 mm 20.32 kg / 44.80 lbs
1 815 Gs
3.05 kg / 6.72 lbs
3048 g / 29.9 N
 18.29 kg / 40.32 lbs
~0 Gs
70 mm 13.38 kg / 29.50 lbs
1 473 Gs
2.01 kg / 4.42 lbs
2007 g / 19.7 N
 12.04 kg / 26.55 lbs
~0 Gs
80 mm 8.98 kg / 19.80 lbs
1 207 Gs
1.35 kg / 2.97 lbs
1347 g / 13.2 N
 8.08 kg / 17.82 lbs
~0 Gs
90 mm 6.14 kg / 13.53 lbs
998 Gs
0.92 kg / 2.03 lbs
920 g / 9.0 N
 5.52 kg / 12.18 lbs
~0 Gs
100 mm 4.27 kg / 9.40 lbs
832 Gs
0.64 kg / 1.41 lbs
640 g / 6.3 N
 3.84 kg / 8.46 lbs
~0 Gs
Two magnetic products attract each other from a much further distance than a neodymium and metal combination. The setup of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Designing a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the collision energy is massive. The repulsion force is a bit weaker than the connection force, but still impressive.
*Flux density between like poles is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Note: Estimates show friction force of two same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - warnings
MPL 100x40x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 30.5 cm
Hearing aid 10 Gs (1.0 mT) 24.0 cm
Mechanical watch 20 Gs (2.0 mT) 18.5 cm
Mobile device 40 Gs (4.0 mT) 14.5 cm
Car key 50 Gs (5.0 mT) 13.5 cm
Payment card 400 Gs (40.0 mT) 5.5 cm
HDD hard drive 600 Gs (60.0 mT) 4.5 cm
Powerful magnet radiation poses a large risk to electronic devices and medical implants. These NdFeB products produce a flux that prevents correct functioning of digital equipment. Notice: the invisible magnetic field passes through tissues and plastic. Special caution must be taken by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MPL 100x40x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.84 km/h
(4.96 m/s)
 7.37 J
30 mm 25.80 km/h
(7.17 m/s)
 15.41 J
50 mm 32.20 km/h
(8.94 m/s)
 23.99 J
100 mm 45.13 km/h
(12.54 m/s)
 47.14 J
Magnetic elements are prone to chipping – a strong collision with metal can result in shattering. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can destroy the magnet or injury to skin. Hold the magnet firmly during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when playing with large magnets.

Table 9: Surface protection spec
MPL 100x40x20 / 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. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MPL 100x40x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 131 922 Mx 1319.2 µWb
Pc Coefficient 0.38 Low (Flat)
Total magnetic flux emitted by the magnet pole. Essential parameter in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 100x40x20 / N38

Environment Effective steel pull Effect
Air (land) 120.01 kg Standard
Water (riverbed) 137.41 kg
(+17.40 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
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 holds only ~20% of its perpendicular strength.

2. Steel saturation

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.38

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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%
Environmental data
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: 020109-2026
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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 100x40x20 mm and a weight of 600 g, guarantees the highest quality connection. This magnetic block with a force of 1177.33 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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 100x40x20 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
They constitute a key element in the production of wind generators and material handling systems. They work great as fasteners under tiles, wood, or glass. 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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 100x40x20 / N38 model is magnetized through the thickness (dimension 20 mm), which means that the N and S poles are located on its largest, flat surfaces. 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: 100 mm (length), 40 mm (width), and 20 mm (thickness). It is a magnetic block with dimensions 100x40x20 mm and a self-weight of 600 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
  • They retain their magnetic properties even under external field action,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnets have huge magnetic induction on the outer layer,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • In view of the option of accurate shaping and adaptation to custom solutions, neodymium magnets can be modeled in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Fundamental importance in advanced technology sectors – they are used in computer drives, motor assemblies, advanced medical instruments, also multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also raises 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 oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Maximum magnetic pulling force – what affects it?

Holding force of 120.01 kg is a measurement result conducted under standard conditions:
  • using a plate made of low-carbon steel, serving as a magnetic yoke
  • whose transverse dimension is min. 10 mm
  • characterized by smoothness
  • without any insulating layer between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Holding efficiency is affected by specific conditions, mainly (from most important):
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Steel thickness – too thin steel does not close the flux, causing part of the flux to be wasted into the air.
  • Steel grade – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Surface finish – ideal contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was measured with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

Safe handling of neodymium magnets
Respect the power

Exercise caution. Rare earth magnets act from a long distance and snap with huge force, often faster than you can move away.

Danger to the youngest

Strictly store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are life-threatening.

Machining danger

Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Fragile material

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Allergy Warning

It is widely known that nickel (standard magnet coating) is a common allergen. If you have an allergy, refrain from direct skin contact or opt for coated magnets.

Precision electronics

Note: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a safe distance from your mobile, device, and GPS.

Medical interference

Warning for patients: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.

Cards and drives

Equipment safety: Strong magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, timepieces).

Thermal limits

Do not overheat. NdFeB magnets are susceptible to heat. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Serious injuries

Big blocks can break fingers in a fraction of a second. Do not place your hand between two attracting surfaces.

Danger! Looking for details? Check our post: Why are neodymium magnets dangerous?