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MPL 30x20x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020286

GTIN/EAN: 5906301811848

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

18 g

Magnetization Direction

↑ axial

Load capacity

6.30 kg / 61.84 N

Magnetic Induction

180.57 mT / 1806 Gs

Coating

[NiCuNi] Nickel

check technical specifications »

10.23 ZŁ with VAT / pcs + price for transport

8.32 ZŁ net + 23% VAT / pcs

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Detailed specification - MPL 30x20x4 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020286
GTIN/EAN 5906301811848
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 30 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 18 g
Magnetization Direction ↑ axial
Load capacity ~ ? 6.30 kg / 61.84 N
Magnetic Induction ~ ? 180.57 mT / 1806 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x4 / 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 simulation of the magnet - report

These data are the direct effect of a engineering calculation. Values were calculated on models for the material Nd2Fe14B. Actual conditions may deviate from the simulation results. Treat these calculations as a reference point when designing systems.

Table 1: Static pull force (force vs gap) - characteristics
MPL 30x20x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1805 Gs
180.5 mT
 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
 strong
1 mm 1728 Gs
172.8 mT
 5.77 kg / 12.72 pounds
5771.5 g / 56.6 N
 strong
2 mm 1628 Gs
162.8 mT
 5.13 kg / 11.30 pounds
5125.7 g / 50.3 N
 strong
3 mm 1515 Gs
151.5 mT
 4.43 kg / 9.78 pounds
4434.6 g / 43.5 N
 strong
5 mm 1271 Gs
127.1 mT
 3.12 kg / 6.89 pounds
3124.3 g / 30.6 N
 strong
10 mm 751 Gs
75.1 mT
 1.09 kg / 2.40 pounds
1088.7 g / 10.7 N
 safe
15 mm 435 Gs
43.5 mT
 0.37 kg / 0.81 pounds
366.3 g / 3.6 N
 safe
20 mm 262 Gs
26.2 mT
 0.13 kg / 0.29 pounds
132.6 g / 1.3 N
 safe
30 mm 110 Gs
11.0 mT
 0.02 kg / 0.05 pounds
23.2 g / 0.2 N
 safe
50 mm 30 Gs
3.0 mT
 0.00 kg / 0.00 pounds
1.8 g / 0.0 N
 safe
Pulling power weakens significantly with every subsequent millimeter of distance. Note that even a microscopic distance (e.g., contamination, varnish, dust) noticeably weakens the grip. Magnetic products work optimally at the point of direct contact; distance drastically cuts the force. Analyze how quickly the parameters drop, when the magnet does not touch flatly to the metal substrate. When planning the mounting, discard redundant distances.

Table 2: Slippage load (wall)
MPL 30x20x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.26 kg / 2.78 pounds
1260.0 g / 12.4 N
1 mm Stal (~0.2) 1.15 kg / 2.54 pounds
1154.0 g / 11.3 N
2 mm Stal (~0.2) 1.03 kg / 2.26 pounds
1026.0 g / 10.1 N
3 mm Stal (~0.2) 0.89 kg / 1.95 pounds
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.62 kg / 1.38 pounds
624.0 g / 6.1 N
10 mm Stal (~0.2) 0.22 kg / 0.48 pounds
218.0 g / 2.1 N
15 mm Stal (~0.2) 0.07 kg / 0.16 pounds
74.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 pounds
26.0 g / 0.3 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below defines the estimated shear load sufficient to start the shifting of the magnet vertically on a vertical steel plate (assuming standard friction). The holding force depends on the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 30x20x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.26 kg / 2.78 pounds
1260.0 g / 12.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.63 kg / 1.39 pounds
630.0 g / 6.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.15 kg / 6.94 pounds
3150.0 g / 30.9 N
When hanging a element on a vertical plane (e.g., a board), it will only hold barely approx. 1/5 of its maximum pull force. Gravity and a low friction coefficient influence the fact that holders slide down easier than they detach. Want to create a vertical fastening? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the holder will give way down under a significantly smaller weight. Utilizing a rubberized layer can effectively improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MPL 30x20x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.63 kg / 1.39 pounds
630.0 g / 6.2 N
1 mm
25%
 1.58 kg / 3.47 pounds
1575.0 g / 15.5 N
2 mm
50%
 3.15 kg / 6.94 pounds
3150.0 g / 30.9 N
3 mm
75%
 4.73 kg / 10.42 pounds
4725.0 g / 46.4 N
5 mm
100%
 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
10 mm
100%
 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
11 mm
100%
 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
12 mm
100%
 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
A too thin steel is incapable of take in the full magnetic flux, which weakens actual performance of the holder. If you mount a strong magnet to a weak sheet, the field will penetrate right through and the holding will be smaller. To achieve full efficiency of this magnet's power, you need a suitably thick piece of metal. The saturation phenomenon causes that on thin elements (e.g., car bodies), the magnet holds weaker. We recommend selecting the steel cross-section based on the following data.

Table 5: Working in heat (stability) - power drop
MPL 30x20x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 6.30 kg / 13.89 pounds
6300.0 g / 61.8 N
 OK
40 °C -2.2% 6.16 kg / 13.58 pounds
6161.4 g / 60.4 N
 OK
60 °C -4.4% 6.02 kg / 13.28 pounds
6022.8 g / 59.1 N
80 °C -6.6% 5.88 kg / 12.97 pounds
5884.2 g / 57.7 N
100 °C -28.8% 4.49 kg / 9.89 pounds
4485.6 g / 44.0 N
Classic neodymiums irreversibly lose parameters above the temperature limit. Protect against heat – excessive heat can permanently destroy this product. With increasing heat, the neodymium's capacity momentarily decreases. Do not use this magnet close to heaters higher than its operating temperature limit. Too high temperature will cause destruction of magnetism.
*Technical advisory: Thermal stability depends not only on the material grade, but also on the magnet's shape. Flat magnets (pancake types) risk losing magnetic properties under lower heat stress than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field range
MPL 30x20x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.06 kg / 26.58 pounds
3 198 Gs
1.81 kg / 3.99 pounds
1809 g / 17.7 N
 N/A
1 mm 11.59 kg / 25.55 pounds
3 540 Gs
1.74 kg / 3.83 pounds
1739 g / 17.1 N
 10.43 kg / 23.00 pounds
~0 Gs
2 mm 11.05 kg / 24.35 pounds
3 456 Gs
1.66 kg / 3.65 pounds
1657 g / 16.3 N
 9.94 kg / 21.92 pounds
~0 Gs
3 mm 10.45 kg / 23.03 pounds
3 361 Gs
1.57 kg / 3.45 pounds
1567 g / 15.4 N
 9.40 kg / 20.73 pounds
~0 Gs
5 mm 9.15 kg / 20.18 pounds
3 146 Gs
1.37 kg / 3.03 pounds
1373 g / 13.5 N
 8.24 kg / 18.16 pounds
~0 Gs
10 mm 5.98 kg / 13.18 pounds
2 543 Gs
0.90 kg / 1.98 pounds
897 g / 8.8 N
 5.38 kg / 11.86 pounds
~0 Gs
20 mm 2.08 kg / 4.59 pounds
1 501 Gs
0.31 kg / 0.69 pounds
313 g / 3.1 N
 1.88 kg / 4.13 pounds
~0 Gs
50 mm 0.10 kg / 0.22 pounds
331 Gs
0.02 kg / 0.03 pounds
15 g / 0.1 N
 0.09 kg / 0.20 pounds
~0 Gs
60 mm 0.04 kg / 0.10 pounds
219 Gs
0.01 kg / 0.01 pounds
7 g / 0.1 N
 0.04 kg / 0.09 pounds
~0 Gs
70 mm 0.02 kg / 0.05 pounds
151 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
80 mm 0.01 kg / 0.02 pounds
108 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
90 mm 0.01 kg / 0.01 pounds
80 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.01 pounds
60 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~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 generates a stronger field and a wider radius of performance. Designing a powerful holder? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is huge. The repulsion force is a bit weaker than the attraction, but still impressive.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Important: Figures demonstrate friction force of dual same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 30x20x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.0 cm
Hearing aid 10 Gs (1.0 mT) 7.5 cm
Timepiece 20 Gs (2.0 mT) 6.0 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Car key 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field is a serious hazard to IT equipment as well as pacemakers. These neodymiums produce a field that destroys function of digital equipment. Remember: the invisible magnetic field passes through tissues and housings. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MPL 30x20x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.81 km/h
(5.78 m/s)
 0.30 J
30 mm 32.75 km/h
(9.10 m/s)
 0.75 J
50 mm 42.20 km/h
(11.72 m/s)
 1.24 J
100 mm 59.66 km/h
(16.57 m/s)
 2.47 J
Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Impact energy can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Surface protection spec
MPL 30x20x4 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MPL 30x20x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 12 775 Mx 127.8 µWb
Pc Coefficient 0.22 Low (Flat)
Flux value passing through the magnet pole. Key data for generator designers and motors. Pc value defines the working geometry.

Table 11: Underwater work (magnet fishing)
MPL 30x20x4 / N38

Environment Effective steel pull Effect
Air (land) 6.30 kg Standard
Water (riverbed) 7.21 kg
(+0.91 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

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

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) significantly limits 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) = 0.22

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 and environmental data
Chemical composition
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: 020286-2026
Measurement Calculator
Force (pull)
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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 30x20x4 mm and a weight of 18 g, guarantees the highest quality connection. As a block magnet with high power (approx. 6.30 kg), this product is available off-the-shelf from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 30x20x4 / 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.
Plate magnets MPL 30x20x4 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 6.30 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 30x20x4 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 30x20x4 / N38 model is magnetized axially (dimension 4 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: 30 mm (length), 20 mm (width), and 4 mm (thickness). It is a magnetic block with dimensions 30x20x4 mm and a self-weight of 18 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

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose strength, even during around ten years – the reduction in lifting capacity is only ~1% (based on measurements),
  • They retain their magnetic properties even under strong external field,
  • In other words, due to the metallic finish of gold, the element is aesthetically pleasing,
  • The surface of neodymium magnets generates a concentrated 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 form) even at a temperature of 230°C or more...
  • Due to the potential of free forming and customization to specialized requirements, neodymium magnets can be manufactured in a wide range of forms and dimensions, which increases their versatility,
  • Universal use in electronics industry – they find application in data components, electric drive systems, precision medical tools, also industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest 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 magnets in rubber or plastics, which secure oxidation and corrosion.
  • We suggest casing - magnetic mount, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets are risky, if swallowed, which gains importance in the context of child safety. Furthermore, small components of these magnets are able to complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

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

Information about lifting capacity was determined for the most favorable conditions, assuming:
  • on a base made of mild steel, optimally conducting the magnetic flux
  • with a thickness no less than 10 mm
  • with an polished contact surface
  • without any insulating layer between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature room level

Magnet lifting force in use – key factors

In practice, the real power results from several key aspects, ranked from most significant:
  • Gap (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, rust or debris).
  • Load vector – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
  • Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
  • Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity was determined with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the holding force is lower. In addition, even a slight gap between the magnet and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
Maximum temperature

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Keep away from electronics

Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.

No play value

Strictly store magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are tragic.

Flammability

Drilling and cutting of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Fragile material

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them breaking into small pieces.

Immense force

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

ICD Warning

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Nickel coating and allergies

Certain individuals experience a contact allergy to Ni, which is the common plating for neodymium magnets. Frequent touching might lead to a rash. We recommend use safety gloves.

Bone fractures

Pinching hazard: The pulling power is so great that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Protect data

Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Caution! Want to know more? Read our article: Are neodymium magnets dangerous?