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MPL 30x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020143

GTIN/EAN: 5906301811497

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

22.5 g

Magnetization Direction

↑ axial

Load capacity

8.86 kg / 86.90 N

Magnetic Induction

220.03 mT / 2200 Gs

Coating

[NiCuNi] Nickel

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Technical details - MPL 30x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 30x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020143
GTIN/EAN 5906301811497
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 5 mm [±0,1 mm]
Weight 22.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 8.86 kg / 86.90 N
Magnetic Induction ~ ? 220.03 mT / 2200 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x5 / 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 - data

The following data constitute the outcome of a physical simulation. Results are based on algorithms for the material Nd2Fe14B. Operational conditions may differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - power drop
MPL 30x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2200 Gs
220.0 mT
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
 warning
1 mm 2092 Gs
209.2 mT
 8.01 kg / 17.67 lbs
8013.9 g / 78.6 N
 warning
2 mm 1961 Gs
196.1 mT
 7.04 kg / 15.53 lbs
7042.1 g / 69.1 N
 warning
3 mm 1817 Gs
181.7 mT
 6.04 kg / 13.32 lbs
6041.8 g / 59.3 N
 warning
5 mm 1516 Gs
151.6 mT
 4.21 kg / 9.28 lbs
4209.6 g / 41.3 N
 warning
10 mm 892 Gs
89.2 mT
 1.46 kg / 3.21 lbs
1456.2 g / 14.3 N
 low risk
15 mm 519 Gs
51.9 mT
 0.49 kg / 1.09 lbs
492.4 g / 4.8 N
 low risk
20 mm 313 Gs
31.3 mT
 0.18 kg / 0.40 lbs
179.8 g / 1.8 N
 low risk
30 mm 132 Gs
13.2 mT
 0.03 kg / 0.07 lbs
31.9 g / 0.3 N
 low risk
50 mm 37 Gs
3.7 mT
 0.00 kg / 0.01 lbs
2.5 g / 0.0 N
 low risk
Magnetic force decreases drastically with every subsequent millimeter of gap. Remember that even the smallest gap (e.g., dirt, paint, veneer) noticeably diminishes the holding power. Magnetic products work strongest at the point of direct contact; gap drastically cuts the force. Notice how quickly the load capacity fall, when the magnet does not touch flatly to the steel surface. When designing the assembly, avoid redundant distances.

Table 2: Sliding force (wall)
MPL 30x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.77 kg / 3.91 lbs
1772.0 g / 17.4 N
1 mm Stal (~0.2) 1.60 kg / 3.53 lbs
1602.0 g / 15.7 N
2 mm Stal (~0.2) 1.41 kg / 3.10 lbs
1408.0 g / 13.8 N
3 mm Stal (~0.2) 1.21 kg / 2.66 lbs
1208.0 g / 11.9 N
5 mm Stal (~0.2) 0.84 kg / 1.86 lbs
842.0 g / 8.3 N
10 mm Stal (~0.2) 0.29 kg / 0.64 lbs
292.0 g / 2.9 N
15 mm Stal (~0.2) 0.10 kg / 0.22 lbs
98.0 g / 1.0 N
20 mm Stal (~0.2) 0.04 kg / 0.08 lbs
36.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The following data defines the estimated weight limit required to initiate the sliding of the magnet vertically on a vertical metal surface (assuming typical friction coefficient). The holding force varies with the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 30x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.66 kg / 5.86 lbs
2658.0 g / 26.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.77 kg / 3.91 lbs
1772.0 g / 17.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.89 kg / 1.95 lbs
886.0 g / 8.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
When hanging a holder on a upright wall (e.g., a car body), it you can count on barely about 20%-30% of its maximum pull force. Gravitational force and a weak degree of grip mean that magnets slip easier than they pull off. Planning a hanger? Remember that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the holder will give way down under a noticeably lighter cargo. Application of an anti-slip pad can drastically improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 30x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.89 kg / 1.95 lbs
886.0 g / 8.7 N
1 mm
25%
 2.22 kg / 4.88 lbs
2215.0 g / 21.7 N
2 mm
50%
 4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
3 mm
75%
 6.65 kg / 14.65 lbs
6645.0 g / 65.2 N
5 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
10 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
11 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
12 mm
100%
 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
A thin sheet is unable to absorb the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the flux will pass right through and the attraction force will be weaker. To squeeze 100% of this neodymium's power, you need a suitably thick backing of metal. The saturation effect causes that on delicate walls (e.g., car bodies), the holder holds weaker. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - thermal limit
MPL 30x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 8.86 kg / 19.53 lbs
8860.0 g / 86.9 N
 OK
40 °C -2.2% 8.67 kg / 19.10 lbs
8665.1 g / 85.0 N
 OK
60 °C -4.4% 8.47 kg / 18.67 lbs
8470.2 g / 83.1 N
80 °C -6.6% 8.28 kg / 18.24 lbs
8275.2 g / 81.2 N
100 °C -28.8% 6.31 kg / 13.91 lbs
6308.3 g / 61.9 N
Standard neodymium magnets lose strength past the thermal threshold. Protect against heat – high temperature can irreversibly destroy this magnet. As the temperature rises, the neodymium's capacity briefly drops. Avoid using this magnet in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will lead to destruction of magnetism.
*Technical advisory: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low Pc) are more susceptible to demagnetization under lower heat stress compared to rod magnets. The danger warning in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MPL 30x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.90 kg / 39.47 lbs
3 715 Gs
2.69 kg / 5.92 lbs
2685 g / 26.3 N
 N/A
1 mm 17.10 kg / 37.69 lbs
4 300 Gs
2.56 kg / 5.65 lbs
2565 g / 25.2 N
 15.39 kg / 33.92 lbs
~0 Gs
2 mm 16.19 kg / 35.70 lbs
4 184 Gs
2.43 kg / 5.35 lbs
2429 g / 23.8 N
 14.57 kg / 32.13 lbs
~0 Gs
3 mm 15.23 kg / 33.57 lbs
4 058 Gs
2.28 kg / 5.04 lbs
2284 g / 22.4 N
 13.71 kg / 30.22 lbs
~0 Gs
5 mm 13.22 kg / 29.14 lbs
3 780 Gs
1.98 kg / 4.37 lbs
1982 g / 19.4 N
 11.89 kg / 26.22 lbs
~0 Gs
10 mm 8.51 kg / 18.75 lbs
3 033 Gs
1.28 kg / 2.81 lbs
1276 g / 12.5 N
 7.66 kg / 16.88 lbs
~0 Gs
20 mm 2.94 kg / 6.49 lbs
1 784 Gs
0.44 kg / 0.97 lbs
441 g / 4.3 N
 2.65 kg / 5.84 lbs
~0 Gs
50 mm 0.15 kg / 0.32 lbs
398 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
 0.13 kg / 0.29 lbs
~0 Gs
60 mm 0.06 kg / 0.14 lbs
264 Gs
0.01 kg / 0.02 lbs
10 g / 0.1 N
 0.06 kg / 0.13 lbs
~0 Gs
70 mm 0.03 kg / 0.07 lbs
183 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
80 mm 0.02 kg / 0.04 lbs
131 Gs
0.00 kg / 0.01 lbs
2 g / 0.0 N
 0.01 kg / 0.03 lbs
~0 Gs
90 mm 0.01 kg / 0.02 lbs
97 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.01 lbs
73 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and sheet combination. The connection of magnet-to-magnet generates a stronger field and a larger range of action. Want to build a powerful holder? Apply two magnets instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the pinch force is huge. The repulsion force is marginally weaker than the connection force, but still impressive.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
* Results demonstrate friction force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - warnings
MPL 30x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.5 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Mechanical watch 20 Gs (2.0 mT) 6.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.0 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
A strong magnetic field poses a serious hazard to electronics and medical implants. These NdFeB products produce a flux that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation acts through matter and housings. Exceptional care must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MPL 30x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.97 km/h
(6.10 m/s)
 0.42 J
30 mm 34.74 km/h
(9.65 m/s)
 1.05 J
50 mm 44.76 km/h
(12.43 m/s)
 1.74 J
100 mm 63.29 km/h
(17.58 m/s)
 3.48 J
Neodymium magnets are very brittle – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can destroy the magnet or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when handling with large magnets.

Table 9: Anti-corrosion coating durability
MPL 30x20x5 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MPL 30x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 14 969 Mx 149.7 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value passing through the pole surface. Essential parameter when building generators and motors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 30x20x5 / N38

Environment Effective steel pull Effect
Air (land) 8.86 kg Standard
Water (riverbed) 10.14 kg
(+1.28 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. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet retains merely ~20% of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

*For N38 material, the critical 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%
Ecology and recycling (GPSR)
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020143-2026
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 30x20x5 mm and a weight of 22.5 g, guarantees premium class connection. This rectangular block with a force of 86.90 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.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 30x20x5 / 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 30x20x5 / 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. 8.86 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 30x20x5 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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.
The presented product is a neodymium magnet with precisely defined parameters: 30 mm (length), 20 mm (width), and 5 mm (thickness). The key parameter here is the holding force amounting to approximately 8.86 kg (force ~86.90 N), which, with such a compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of neodymium magnets.

Advantages

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have stable power, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They are noted for resistance to demagnetization induced by external magnetic fields,
  • The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnets exhibit maximum magnetic induction on the outer side,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to the ability of accurate shaping and customization to specialized projects, magnetic components can be modeled in a broad palette of forms and dimensions, which makes them more universal,
  • Versatile presence in future technologies – they serve a role in HDD drives, electromotive mechanisms, medical devices, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in compact constructions

Weaknesses

Problematic aspects of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • Neodymium magnets decrease their power 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 stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Due to limitations in creating threads and complex shapes in magnets, we recommend using a housing - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these products can complicate diagnosis medical in case of swallowing.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Holding force of 8.86 kg is a measurement result conducted under the following configuration:
  • on a base made of mild steel, effectively closing the magnetic flux
  • whose thickness is min. 10 mm
  • characterized by smoothness
  • without any air gap between the magnet and steel
  • during detachment in a direction vertical to the mounting surface
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

In real-world applications, the real power results from a number of factors, ranked from the most important:
  • Air gap (betwixt the magnet and the plate), because even a very small distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Angle of force application – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Material type – ideal substrate is high-permeability steel. Cast iron may have worse magnetic properties.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets
Heat warning

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Electronic hazard

Powerful magnetic fields can erase data on payment cards, HDDs, and storage devices. Keep a distance of min. 10 cm.

Bone fractures

Watch your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Threat to navigation

Navigation devices and smartphones are highly susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

Mechanical processing

Machining of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Warning for allergy sufferers

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, immediately stop handling magnets and use protective gear.

Magnet fragility

Neodymium magnets are ceramic materials, which means they are very brittle. Collision of two magnets leads to them breaking into small pieces.

Do not give to children

NdFeB magnets are not intended for children. Accidental ingestion of several magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates urgent medical intervention.

Respect the power

Exercise caution. Neodymium magnets attract from a distance and connect with massive power, often faster than you can move away.

Medical interference

Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Important! Looking for details? Read our article: Why are neodymium magnets dangerous?