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MPL 80x40x15 / N38 - lamellar magnet

lamellar magnet

Catalog no 020177

GTIN/EAN: 5906301811831

5.00

length

80 mm [±0,1 mm]

Width

40 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

360 g

Magnetization Direction

↑ axial

Load capacity

73.57 kg / 721.75 N

Magnetic Induction

285.78 mT / 2858 Gs

Coating

[NiCuNi] Nickel

check technical specifications »

139.54 ZŁ with VAT / pcs + price for transport

113.45 ZŁ net + 23% VAT / pcs

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Pick up the phone and ask +48 22 499 98 98 if you prefer get in touch by means of form our website.
Lifting power and form of a neodymium magnet can be analyzed with our magnetic calculator.

Orders placed before 14:00 will be shipped the same business day.

Technical data of the product - MPL 80x40x15 / N38 - lamellar magnet

Specification / characteristics - MPL 80x40x15 / N38 - lamellar magnet

properties
properties values
Cat. no. 020177
GTIN/EAN 5906301811831
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 80 mm [±0,1 mm]
Width 40 mm [±0,1 mm]
Height 15 mm [±0,1 mm]
Weight 360 g
Magnetization Direction ↑ axial
Load capacity ~ ? 73.57 kg / 721.75 N
Magnetic Induction ~ ? 285.78 mT / 2858 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 80x40x15 / 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

Physical modeling of the magnet - data

The following information represent the outcome of a physical simulation. Results are based on algorithms for the class Nd2Fe14B. Operational parameters may differ from theoretical values. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - characteristics
MPL 80x40x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2857 Gs
285.7 mT
 73.57 kg / 162.19 LBS
73570.0 g / 721.7 N
 critical level
1 mm 2778 Gs
277.8 mT
 69.55 kg / 153.32 LBS
69546.1 g / 682.2 N
 critical level
2 mm 2693 Gs
269.3 mT
 65.33 kg / 144.03 LBS
65331.2 g / 640.9 N
 critical level
3 mm 2603 Gs
260.3 mT
 61.05 kg / 134.59 LBS
61047.5 g / 598.9 N
 critical level
5 mm 2415 Gs
241.5 mT
 52.56 kg / 115.87 LBS
52559.7 g / 515.6 N
 critical level
10 mm 1943 Gs
194.3 mT
 34.02 kg / 75.00 LBS
34021.1 g / 333.7 N
 critical level
15 mm 1527 Gs
152.7 mT
 21.01 kg / 46.31 LBS
21007.7 g / 206.1 N
 critical level
20 mm 1192 Gs
119.2 mT
 12.81 kg / 28.24 LBS
12808.1 g / 125.6 N
 critical level
30 mm 736 Gs
73.6 mT
 4.89 kg / 10.77 LBS
4886.6 g / 47.9 N
 strong
50 mm 313 Gs
31.3 mT
 0.88 kg / 1.95 LBS
884.8 g / 8.7 N
 safe
Grip strength drops sharply per each millimeter of gap. Note that even a very thin break (e.g., contamination, varnish, veneer) strongly reduces the pull force. Magnetic products hold most effectively during direct contact; gap weakens the force. Observe how flashily the load capacity drop, when the magnet does not adhere tightly to the metal substrate. When designing the mounting, avoid unnecessary gaps.

Table 2: Vertical load (vertical surface)
MPL 80x40x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 14.71 kg / 32.44 LBS
14714.0 g / 144.3 N
1 mm Stal (~0.2) 13.91 kg / 30.67 LBS
13910.0 g / 136.5 N
2 mm Stal (~0.2) 13.07 kg / 28.81 LBS
13066.0 g / 128.2 N
3 mm Stal (~0.2) 12.21 kg / 26.92 LBS
12210.0 g / 119.8 N
5 mm Stal (~0.2) 10.51 kg / 23.17 LBS
10512.0 g / 103.1 N
10 mm Stal (~0.2) 6.80 kg / 15.00 LBS
6804.0 g / 66.7 N
15 mm Stal (~0.2) 4.20 kg / 9.26 LBS
4202.0 g / 41.2 N
20 mm Stal (~0.2) 2.56 kg / 5.65 LBS
2562.0 g / 25.1 N
30 mm Stal (~0.2) 0.98 kg / 2.16 LBS
978.0 g / 9.6 N
50 mm Stal (~0.2) 0.18 kg / 0.39 LBS
176.0 g / 1.7 N
The table below shows the approximate holding capacity required to initiate the slippage of the magnet down against a upright steel plate (considering standard friction coefficient). This parameter is a function of the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MPL 80x40x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
22.07 kg / 48.66 LBS
22071.0 g / 216.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
14.71 kg / 32.44 LBS
14714.0 g / 144.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
7.36 kg / 16.22 LBS
7357.0 g / 72.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
36.79 kg / 81.10 LBS
36785.0 g / 360.9 N
When hanging a holder on a upright wall (e.g., a car body), it will maintain just approx. 20%-30% of its nominal power. Gravity as well as a weak degree of grip influence the fact that magnets slide down faster than they pop off the substrate. Planning a vertical fastening? Note that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will slide down under a noticeably lighter weight. Application of an anti-slip layer can drastically improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 80x40x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 2.45 kg / 5.41 LBS
2452.3 g / 24.1 N
1 mm
8%
 6.13 kg / 13.52 LBS
6130.8 g / 60.1 N
2 mm
17%
 12.26 kg / 27.03 LBS
12261.7 g / 120.3 N
3 mm
25%
 18.39 kg / 40.55 LBS
18392.5 g / 180.4 N
5 mm
42%
 30.65 kg / 67.58 LBS
30654.2 g / 300.7 N
10 mm
83%
 61.31 kg / 135.16 LBS
61308.3 g / 601.4 N
11 mm
92%
 67.44 kg / 148.68 LBS
67439.2 g / 661.6 N
12 mm
100%
 73.57 kg / 162.19 LBS
73570.0 g / 721.7 N
A thin metal plate cannot conduct the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a thin surface, the field will pass right through and the attraction force will be weaker. To achieve the maximum of this magnet's power, you need a suitably thick backing of metal. The saturation phenomenon means that on thin elements (e.g., thin profiles), the magnet holds weaker. We advise picking the steel dimension from these parameters.

Table 5: Working in heat (stability) - thermal limit
MPL 80x40x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 73.57 kg / 162.19 LBS
73570.0 g / 721.7 N
 OK
40 °C -2.2% 71.95 kg / 158.63 LBS
71951.5 g / 705.8 N
 OK
60 °C -4.4% 70.33 kg / 155.06 LBS
70332.9 g / 690.0 N
80 °C -6.6% 68.71 kg / 151.49 LBS
68714.4 g / 674.1 N
100 °C -28.8% 52.38 kg / 115.48 LBS
52381.8 g / 513.9 N
Ordinary NdFeB products lose strength after exceeding the maximum temperature. Avoid high temperatures – heat can irreversibly demagnetize this product. As the temperature rises, the magnet's capacity momentarily drops. Do not use this product close to ovens higher than its working range. Ignoring the limit will cause destruction of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 80x40x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 161.08 kg / 355.13 LBS
4 384 Gs
24.16 kg / 53.27 LBS
24163 g / 237.0 N
 N/A
1 mm 156.77 kg / 345.63 LBS
5 638 Gs
23.52 kg / 51.84 LBS
23516 g / 230.7 N
 141.10 kg / 311.07 LBS
~0 Gs
2 mm 152.27 kg / 335.70 LBS
5 556 Gs
22.84 kg / 50.36 LBS
22841 g / 224.1 N
 137.05 kg / 302.13 LBS
~0 Gs
3 mm 147.69 kg / 325.60 LBS
5 472 Gs
22.15 kg / 48.84 LBS
22153 g / 217.3 N
 132.92 kg / 293.04 LBS
~0 Gs
5 mm 138.36 kg / 305.04 LBS
5 297 Gs
20.75 kg / 45.76 LBS
20754 g / 203.6 N
 124.53 kg / 274.53 LBS
~0 Gs
10 mm 115.08 kg / 253.71 LBS
4 830 Gs
17.26 kg / 38.06 LBS
17262 g / 169.3 N
 103.57 kg / 228.34 LBS
~0 Gs
20 mm 74.49 kg / 164.22 LBS
3 886 Gs
11.17 kg / 24.63 LBS
11174 g / 109.6 N
 67.04 kg / 147.80 LBS
~0 Gs
50 mm 17.20 kg / 37.91 LBS
1 867 Gs
2.58 kg / 5.69 LBS
2580 g / 25.3 N
 15.48 kg / 34.12 LBS
~0 Gs
60 mm 10.70 kg / 23.59 LBS
1 473 Gs
1.60 kg / 3.54 LBS
1605 g / 15.7 N
 9.63 kg / 21.23 LBS
~0 Gs
70 mm 6.78 kg / 14.94 LBS
1 172 Gs
1.02 kg / 2.24 LBS
1017 g / 10.0 N
 6.10 kg / 13.45 LBS
~0 Gs
80 mm 4.38 kg / 9.65 LBS
942 Gs
0.66 kg / 1.45 LBS
657 g / 6.4 N
 3.94 kg / 8.69 LBS
~0 Gs
90 mm 2.89 kg / 6.36 LBS
765 Gs
0.43 kg / 0.95 LBS
433 g / 4.2 N
 2.60 kg / 5.72 LBS
~0 Gs
100 mm 1.94 kg / 4.27 LBS
627 Gs
0.29 kg / 0.64 LBS
291 g / 2.9 N
 1.74 kg / 3.84 LBS
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and sheet setup. The connection of magnet-to-magnet generates a stronger field and a larger range of performance. Want to build a powerful holder? Apply two magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the impact force is huge. The levitation is marginally weaker than the attraction, but still large.
*Flux density between like poles is approximately ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
* Calculations refer to shear force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - precautionary measures
MPL 80x40x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 26.0 cm
Hearing aid 10 Gs (1.0 mT) 20.5 cm
Timepiece 20 Gs (2.0 mT) 16.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 12.5 cm
Remote 50 Gs (5.0 mT) 11.5 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm
A strong magnetic field is a real danger to electronic devices and pacemakers. These NdFeB products produce a field that destroys function of digital equipment. Be aware: the unseen radiation passes through tissues and housings. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MPL 80x40x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.11 km/h
(5.03 m/s)
 4.56 J
30 mm 25.99 km/h
(7.22 m/s)
 9.38 J
50 mm 32.48 km/h
(9.02 m/s)
 14.65 J
100 mm 45.61 km/h
(12.67 m/s)
 28.89 J
Neodymium magnets are very brittle – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can cause material chips or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when working with large magnets.

Table 9: Corrosion resistance
MPL 80x40x15 / 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: Electrical data (Pc)
MPL 80x40x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 94 833 Mx 948.3 µWb
Pc Coefficient 0.33 Low (Flat)
Total magnetic flux emitted by the magnet pole. Essential parameter when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MPL 80x40x15 / N38

Environment Effective steel pull Effect
Air (land) 73.57 kg Standard
Water (riverbed) 84.24 kg
(+10.67 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Warning: On a vertical surface, the magnet retains merely ~20% of its nominal pull.

2. Steel saturation

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

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.33

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
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: 020177-2026
Magnet Unit Converter
Force (pull)
Magnetic Induction
Input a number into any field, and the rest change on the fly.

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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 80x40x15 mm and a weight of 360 g, guarantees premium class connection. As a magnetic bar with high power (approx. 73.57 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects 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. Watch your fingers! Magnets with a force of 73.57 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 80x40x15 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 80x40x15 mm, which, at a weight of 360 g, makes it an element with high energy density. It is a magnetic block with dimensions 80x40x15 mm and a self-weight of 360 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of rare earth magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • Their strength is maintained, and after approximately 10 years it drops only by ~1% (according to research),
  • They are resistant to demagnetization induced by external disturbances,
  • A magnet with a metallic gold surface has better aesthetics,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Possibility of accurate modeling and adapting to concrete requirements,
  • Significant place in electronics industry – they find application in HDD drives, electromotive mechanisms, precision medical tools, also industrial machines.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

Problematic aspects of neodymium magnets: application proposals
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to complicate diagnosis medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Lifting parameters

Maximum holding power of the magnet – what affects it?

The force parameter is a theoretical maximum value executed under specific, ideal conditions:
  • on a plate made of mild steel, perfectly concentrating the magnetic field
  • possessing a thickness of at least 10 mm to avoid saturation
  • characterized by smoothness
  • under conditions of ideal adhesion (metal-to-metal)
  • under perpendicular force vector (90-degree angle)
  • in temp. approx. 20°C

Determinants of practical lifting force of a magnet

Please note that the working load will differ depending on elements below, in order of importance:
  • Air gap (betwixt the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
  • Direction of force – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin sheet causes magnetic saturation, causing part of the power to be lost to the other side.
  • Material composition – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Temperature influence – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Cards and drives

Avoid bringing magnets near a wallet, computer, or screen. The magnetism can permanently damage these devices and wipe information from cards.

Health Danger

Warning for patients: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Adults only

Neodymium magnets are not intended for children. Swallowing several magnets can lead to them pinching intestinal walls, which constitutes a critical condition and necessitates urgent medical intervention.

Powerful field

Be careful. Neodymium magnets act from a long distance and connect with massive power, often quicker than you can move away.

Crushing force

Watch your fingers. Two large magnets will join immediately with a force of several hundred kilograms, crushing anything in their path. Be careful!

Phone sensors

Be aware: rare earth magnets produce a field that interferes with precision electronics. Maintain a safe distance from your mobile, device, and navigation systems.

Protective goggles

Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Do not drill into magnets

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Heat sensitivity

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its properties and pulling force.

Nickel coating and allergies

A percentage of the population suffer from a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Extended handling may cause dermatitis. We strongly advise wear protective gloves.

Danger! Looking for details? Read our article: Are neodymium magnets dangerous?