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MPL 50x50x10 / N38 - lamellar magnet

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

view specifications »

42.88 ZŁ with VAT / pcs + price for transport

34.86 ZŁ net + 23% VAT / pcs

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Detailed specification - 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

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

Technical analysis of the assembly - report

Presented data constitute the direct effect of a mathematical analysis. Results are based on algorithms for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Use these calculations as a supplementary guide when designing systems.

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

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2097 Gs
209.7 mT
 33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
 dangerous!
1 mm 2056 Gs
205.6 mT
 32.43 kg / 71.50 pounds
32430.0 g / 318.1 N
 dangerous!
2 mm 2009 Gs
200.9 mT
 30.96 kg / 68.27 pounds
30964.6 g / 303.8 N
 dangerous!
3 mm 1957 Gs
195.7 mT
 29.38 kg / 64.77 pounds
29380.4 g / 288.2 N
 dangerous!
5 mm 1841 Gs
184.1 mT
 25.99 kg / 57.30 pounds
25992.3 g / 255.0 N
 dangerous!
10 mm 1514 Gs
151.4 mT
 17.58 kg / 38.75 pounds
17577.6 g / 172.4 N
 dangerous!
15 mm 1194 Gs
119.4 mT
 10.93 kg / 24.10 pounds
10931.8 g / 107.2 N
 dangerous!
20 mm 922 Gs
92.2 mT
 6.51 kg / 14.36 pounds
6512.2 g / 63.9 N
 medium risk
30 mm 543 Gs
54.3 mT
 2.26 kg / 4.98 pounds
2260.0 g / 22.2 N
 medium risk
50 mm 209 Gs
20.9 mT
 0.33 kg / 0.74 pounds
334.1 g / 3.3 N
 safe
Magnetic force weakens drastically with every subsequent millimeter of spacing. Keep in mind that even a microscopic distance (e.g., contamination, varnish, rust) significantly reduces the pull force. Magnets hold optimally at the point of direct contact; air break weakens the power. See how quickly the parameters plummet, when the magnet does not touch tightly to the metal substrate. When designing the arrangement, eliminate redundant distances.

Table 2: Sliding load (vertical surface)
MPL 50x50x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 6.75 kg / 14.87 pounds
6746.0 g / 66.2 N
1 mm Stal (~0.2) 6.49 kg / 14.30 pounds
6486.0 g / 63.6 N
2 mm Stal (~0.2) 6.19 kg / 13.65 pounds
6192.0 g / 60.7 N
3 mm Stal (~0.2) 5.88 kg / 12.95 pounds
5876.0 g / 57.6 N
5 mm Stal (~0.2) 5.20 kg / 11.46 pounds
5198.0 g / 51.0 N
10 mm Stal (~0.2) 3.52 kg / 7.75 pounds
3516.0 g / 34.5 N
15 mm Stal (~0.2) 2.19 kg / 4.82 pounds
2186.0 g / 21.4 N
20 mm Stal (~0.2) 1.30 kg / 2.87 pounds
1302.0 g / 12.8 N
30 mm Stal (~0.2) 0.45 kg / 1.00 pounds
452.0 g / 4.4 N
50 mm Stal (~0.2) 0.07 kg / 0.15 pounds
66.0 g / 0.6 N
This section presents the theoretical force needed to cause the shifting of the magnet vertically on a vertical steel plate (assuming standard friction). This value varies with the gap size between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 50x50x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
10.12 kg / 22.31 pounds
10119.0 g / 99.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
6.75 kg / 14.87 pounds
6746.0 g / 66.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.37 kg / 7.44 pounds
3373.0 g / 33.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
16.87 kg / 37.18 pounds
16865.0 g / 165.4 N
When mounting a magnet on a vertical plane (e.g., a fridge), it will only hold just approx. 20%-30% of its nominal power. Gravity and a weak degree of grip cause that holders slip easier than they pull off. Designing a hanger? Remember that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the holder will give way down under a significantly smaller load. Application of an anti-slip coating can significantly improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MPL 50x50x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.69 kg / 3.72 pounds
1686.5 g / 16.5 N
1 mm
13%
 4.22 kg / 9.30 pounds
4216.3 g / 41.4 N
2 mm
25%
 8.43 kg / 18.59 pounds
8432.5 g / 82.7 N
3 mm
38%
 12.65 kg / 27.89 pounds
12648.8 g / 124.1 N
5 mm
63%
 21.08 kg / 46.48 pounds
21081.2 g / 206.8 N
10 mm
100%
 33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
11 mm
100%
 33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
12 mm
100%
 33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
A thin sheet is unable to absorb the entire magnetic field, which wastes potential of the magnet. Should you attach a powerful product to a too thin substrate, the field will pass right through and the holding will be smaller. To squeeze full efficiency of this magnet's potential, you need a suitably thick piece of steel. The material oversaturation means that on sheet metal structures (e.g., thin profiles), the holder shows lower pull force. We advise picking the steel cross-section according to the table below.

Table 5: Working in heat (material behavior) - resistance threshold
MPL 50x50x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 33.73 kg / 74.36 pounds
33730.0 g / 330.9 N
 OK
40 °C -2.2% 32.99 kg / 72.73 pounds
32987.9 g / 323.6 N
 OK
60 °C -4.4% 32.25 kg / 71.09 pounds
32245.9 g / 316.3 N
80 °C -6.6% 31.50 kg / 69.45 pounds
31503.8 g / 309.1 N
100 °C -28.8% 24.02 kg / 52.95 pounds
24015.8 g / 235.6 N
Ordinary NdFeB products lose power past the thermal threshold. Watch out for overheating – excessive heat can irreversibly damage this magnet. With increasing heat, the neodymium's force momentarily decreases. Avoid using this product close to heaters higher than its working range. Exceeding the critical threshold will result in destruction of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MPL 50x50x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 67.80 kg / 149.46 pounds
3 611 Gs
10.17 kg / 22.42 pounds
10169 g / 99.8 N
 N/A
1 mm 66.54 kg / 146.70 pounds
4 156 Gs
9.98 kg / 22.01 pounds
9982 g / 97.9 N
 59.89 kg / 132.03 pounds
~0 Gs
2 mm 65.18 kg / 143.70 pounds
4 113 Gs
9.78 kg / 21.56 pounds
9777 g / 95.9 N
 58.66 kg / 129.33 pounds
~0 Gs
3 mm 63.74 kg / 140.53 pounds
4 067 Gs
9.56 kg / 21.08 pounds
9562 g / 93.8 N
 57.37 kg / 126.48 pounds
~0 Gs
5 mm 60.67 kg / 133.75 pounds
3 968 Gs
9.10 kg / 20.06 pounds
9101 g / 89.3 N
 54.60 kg / 120.38 pounds
~0 Gs
10 mm 52.24 kg / 115.18 pounds
3 682 Gs
7.84 kg / 17.28 pounds
7836 g / 76.9 N
 47.02 kg / 103.66 pounds
~0 Gs
20 mm 35.33 kg / 77.89 pounds
3 028 Gs
5.30 kg / 11.68 pounds
5299 g / 52.0 N
 31.80 kg / 70.10 pounds
~0 Gs
50 mm 7.69 kg / 16.96 pounds
1 413 Gs
1.15 kg / 2.54 pounds
1154 g / 11.3 N
 6.92 kg / 15.26 pounds
~0 Gs
60 mm 4.54 kg / 10.01 pounds
1 086 Gs
0.68 kg / 1.50 pounds
681 g / 6.7 N
 4.09 kg / 9.01 pounds
~0 Gs
70 mm 2.72 kg / 6.01 pounds
841 Gs
0.41 kg / 0.90 pounds
409 g / 4.0 N
 2.45 kg / 5.41 pounds
~0 Gs
80 mm 1.67 kg / 3.68 pounds
658 Gs
0.25 kg / 0.55 pounds
250 g / 2.5 N
 1.50 kg / 3.31 pounds
~0 Gs
90 mm 1.05 kg / 2.31 pounds
521 Gs
0.16 kg / 0.35 pounds
157 g / 1.5 N
 0.94 kg / 2.08 pounds
~0 Gs
100 mm 0.67 kg / 1.48 pounds
417 Gs
0.10 kg / 0.22 pounds
101 g / 1.0 N
 0.60 kg / 1.33 pounds
~0 Gs
Two magnets interact 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. Designing a solid fastener? Use a pair of magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the pinch force is extreme. The repulsion force is marginally weaker than the connection force, but still large.
*Field value in repulsion mode reaches ~0 Gs in the exact middle between the magnets (due to field cancellation).
* Figures apply to sliding force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - 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
Phone / Smartphone 40 Gs (4.0 mT) 10.0 cm
Car key 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
Powerful magnet radiation poses a large risk to electronics as well as pacemakers. These neodymiums generate a flux that disrupts operation of sensitive medical devices. Remember: the unseen radiation passes through tissues and glass. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
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
Neodymium magnets are prone to chipping – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can cause material chips or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Anti-corrosion coating 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)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MPL 50x50x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 61 501 Mx 615.0 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value emitted by the pole surface. Essential parameter for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Submerged application
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.

2. Steel saturation

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

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (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 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
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%
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: 020167-2026
Magnet Unit Converter
Magnet pull force
Field Strength
Simply complete one field, to let the tool compute the rest instantly.

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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 50x50x10 mm and a weight of 187.5 g, guarantees premium class connection. This magnetic block with a force of 330.92 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 33.73 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 50x50x10 / N38 are the foundation for many industrial devices, such as filters catching filings 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. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. 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. In practice, this means that this magnet has the greatest attraction force on its main planes (50x50 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 50x50x10 mm, which, at a weight of 187.5 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 33.73 kg (force ~330.92 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
  • Neodymium magnets are exceptionally resistant to loss of magnetic properties caused by external field sources,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to the option of precise molding and customization to unique needs, magnetic components can be created in a wide range of shapes and sizes, which amplifies use scope,
  • Universal use in high-tech industry – they are used in data components, electric motors, precision medical tools, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in miniature devices

Cons

Characteristics of disadvantages of neodymium magnets: application proposals
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in producing threads and complicated forms in magnets, we recommend using a housing - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these devices are able to complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Highest magnetic holding force – what affects it?

The load parameter shown refers to the maximum value, obtained under ideal test conditions, meaning:
  • with the use of a sheet made of special test steel, guaranteeing full magnetic saturation
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a surface perfectly flat
  • without any insulating layer between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

Bear in mind that the application force may be lower subject to the following factors, in order of importance:
  • Clearance – existence of any layer (paint, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Steel type – mild steel gives the best results. Higher carbon content lower magnetic properties and lifting capacity.
  • Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Precautions when working with NdFeB magnets
Nickel coating and allergies

Some people experience a contact allergy to Ni, which is the typical protective layer for neodymium magnets. Extended handling can result in dermatitis. We suggest use protective gloves.

Electronic devices

Do not bring magnets close to a purse, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Health Danger

Life threat: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Adults only

Strictly store magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are very dangerous.

Magnets are brittle

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them cracking into small pieces.

Safe operation

Use magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their force.

Operating temperature

Control the heat. Heating the magnet to high heat will destroy its magnetic structure and pulling force.

Machining danger

Dust generated during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Bone fractures

Watch your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Precision electronics

Remember: neodymium magnets produce a field that interferes with sensitive sensors. Maintain a safe distance from your mobile, device, and GPS.

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