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MW 40x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010066

GTIN/EAN: 5906301810650

Diameter Ø

40 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

94.25 g

Magnetization Direction

↑ axial

Load capacity

27.73 kg / 271.99 N

Magnetic Induction

277.22 mT / 2772 Gs

Coating

[NiCuNi] Nickel

product parameters »

36.57 ZŁ with VAT / pcs + price for transport

29.73 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 40x10 / N38 - cylindrical magnet

Specification / characteristics - MW 40x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010066
GTIN/EAN 5906301810650
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 40 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 94.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 27.73 kg / 271.99 N
Magnetic Induction ~ ? 277.22 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x10 / N38 - cylindrical 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 analysis of the product - data

Presented data represent the outcome of a mathematical calculation. Values are based on algorithms for the class Nd2Fe14B. Real-world parameters may deviate from the simulation results. Use these data as a supplementary guide for designers.

Table 1: Static force (force vs distance) - power drop
MW 40x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2772 Gs
277.2 mT
 27.73 kg / 61.13 pounds
27730.0 g / 272.0 N
 dangerous!
1 mm 2678 Gs
267.8 mT
 25.89 kg / 57.08 pounds
25889.6 g / 254.0 N
 dangerous!
2 mm 2573 Gs
257.3 mT
 23.89 kg / 52.68 pounds
23893.3 g / 234.4 N
 dangerous!
3 mm 2459 Gs
245.9 mT
 21.83 kg / 48.12 pounds
21827.6 g / 214.1 N
 dangerous!
5 mm 2216 Gs
221.6 mT
 17.73 kg / 39.08 pounds
17728.1 g / 173.9 N
 dangerous!
10 mm 1611 Gs
161.1 mT
 9.37 kg / 20.66 pounds
9371.0 g / 91.9 N
 strong
15 mm 1121 Gs
112.1 mT
 4.54 kg / 10.01 pounds
4538.6 g / 44.5 N
 strong
20 mm 775 Gs
77.5 mT
 2.17 kg / 4.77 pounds
2165.8 g / 21.2 N
 strong
30 mm 387 Gs
38.7 mT
 0.54 kg / 1.19 pounds
539.8 g / 5.3 N
 safe
50 mm 125 Gs
12.5 mT
 0.06 kg / 0.12 pounds
56.6 g / 0.6 N
 safe
Pulling power drops sharply per each millimeter of distance. Keep in mind that every additional insulation layer (e.g., contamination, varnish, rust) significantly reduces the pull force. Magnetic products hold strongest at the point of direct contact; distance nullifies the force. Analyze how flashily the parameters drop, when the magnet does not adhere flatly to the steel surface. When planning the assembly, eliminate unnecessary gaps.

Table 2: Slippage load (wall)
MW 40x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 5.55 kg / 12.23 pounds
5546.0 g / 54.4 N
1 mm Stal (~0.2) 5.18 kg / 11.42 pounds
5178.0 g / 50.8 N
2 mm Stal (~0.2) 4.78 kg / 10.53 pounds
4778.0 g / 46.9 N
3 mm Stal (~0.2) 4.37 kg / 9.63 pounds
4366.0 g / 42.8 N
5 mm Stal (~0.2) 3.55 kg / 7.82 pounds
3546.0 g / 34.8 N
10 mm Stal (~0.2) 1.87 kg / 4.13 pounds
1874.0 g / 18.4 N
15 mm Stal (~0.2) 0.91 kg / 2.00 pounds
908.0 g / 8.9 N
20 mm Stal (~0.2) 0.43 kg / 0.96 pounds
434.0 g / 4.3 N
30 mm Stal (~0.2) 0.11 kg / 0.24 pounds
108.0 g / 1.1 N
50 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
The table below indicates the theoretical weight limit required to start the downward movement of the magnet downwards along a vertical metal surface (assuming standard friction). This parameter varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 40x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
8.32 kg / 18.34 pounds
8319.0 g / 81.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
5.55 kg / 12.23 pounds
5546.0 g / 54.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.77 kg / 6.11 pounds
2773.0 g / 27.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
13.87 kg / 30.57 pounds
13865.0 g / 136.0 N
When hanging a element on a upright surface (e.g., a car body), it will maintain only approx. 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that holders slip easier than they detach. Planning a vertical fastening? Note that the shear force is significantly lower than the maximum static pull force. On a painted metal, the magnet will slide down under a noticeably lighter weight. Utilizing a rubberized coating can significantly raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 40x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.39 kg / 3.06 pounds
1386.5 g / 13.6 N
1 mm
13%
 3.47 kg / 7.64 pounds
3466.3 g / 34.0 N
2 mm
25%
 6.93 kg / 15.28 pounds
6932.5 g / 68.0 N
3 mm
38%
 10.40 kg / 22.93 pounds
10398.8 g / 102.0 N
5 mm
63%
 17.33 kg / 38.21 pounds
17331.3 g / 170.0 N
10 mm
100%
 27.73 kg / 61.13 pounds
27730.0 g / 272.0 N
11 mm
100%
 27.73 kg / 61.13 pounds
27730.0 g / 272.0 N
12 mm
100%
 27.73 kg / 61.13 pounds
27730.0 g / 272.0 N
A too thin steel is unable to conduct the full magnetic flux, which weakens actual performance of the holder. Should you mount a strong magnet to a thin surface, the flux will pass right through and the attraction force will be weaker. To utilize the maximum of this magnet's potential, you require a sufficiently solid piece of steel. The material oversaturation means that on sheet metal structures (e.g., car bodies), the product holds weaker. We advise picking the steel dimension according to the table below.

Table 5: Working in heat (material behavior) - power drop
MW 40x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 27.73 kg / 61.13 pounds
27730.0 g / 272.0 N
 OK
40 °C -2.2% 27.12 kg / 59.79 pounds
27119.9 g / 266.0 N
 OK
60 °C -4.4% 26.51 kg / 58.44 pounds
26509.9 g / 260.1 N
80 °C -6.6% 25.90 kg / 57.10 pounds
25899.8 g / 254.1 N
100 °C -28.8% 19.74 kg / 43.53 pounds
19743.8 g / 193.7 N
Standard neodymium magnets irreversibly lose power above the temperature limit. Protect against heat – excessive heat can permanently demagnetize this magnet. With increasing heat, the neodymium's power briefly drops. Do not use this magnet near heat sources higher than its operating temperature limit. Ignoring the limit will cause permanent loss of magnetic properties.
*Important note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) may lose charge permanently at lower temperatures than long magnets. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 40x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 59.52 kg / 131.22 pounds
4 382 Gs
8.93 kg / 19.68 pounds
8928 g / 87.6 N
 N/A
1 mm 57.61 kg / 127.01 pounds
5 454 Gs
8.64 kg / 19.05 pounds
8642 g / 84.8 N
 51.85 kg / 114.31 pounds
~0 Gs
2 mm 55.57 kg / 122.52 pounds
5 357 Gs
8.34 kg / 18.38 pounds
8336 g / 81.8 N
 50.01 kg / 110.26 pounds
~0 Gs
3 mm 53.46 kg / 117.85 pounds
5 254 Gs
8.02 kg / 17.68 pounds
8019 g / 78.7 N
 48.11 kg / 106.07 pounds
~0 Gs
5 mm 49.08 kg / 108.20 pounds
5 034 Gs
7.36 kg / 16.23 pounds
7362 g / 72.2 N
 44.17 kg / 97.38 pounds
~0 Gs
10 mm 38.05 kg / 83.89 pounds
4 433 Gs
5.71 kg / 12.58 pounds
5708 g / 56.0 N
 34.25 kg / 75.50 pounds
~0 Gs
20 mm 20.11 kg / 44.35 pounds
3 223 Gs
3.02 kg / 6.65 pounds
3017 g / 29.6 N
 18.10 kg / 39.91 pounds
~0 Gs
50 mm 2.27 kg / 5.01 pounds
1 083 Gs
0.34 kg / 0.75 pounds
341 g / 3.3 N
 2.05 kg / 4.51 pounds
~0 Gs
60 mm 1.16 kg / 2.55 pounds
773 Gs
0.17 kg / 0.38 pounds
174 g / 1.7 N
 1.04 kg / 2.30 pounds
~0 Gs
70 mm 0.62 kg / 1.36 pounds
565 Gs
0.09 kg / 0.20 pounds
93 g / 0.9 N
 0.56 kg / 1.23 pounds
~0 Gs
80 mm 0.35 kg / 0.76 pounds
422 Gs
0.05 kg / 0.11 pounds
52 g / 0.5 N
 0.31 kg / 0.69 pounds
~0 Gs
90 mm 0.20 kg / 0.44 pounds
322 Gs
0.03 kg / 0.07 pounds
30 g / 0.3 N
 0.18 kg / 0.40 pounds
~0 Gs
100 mm 0.12 kg / 0.27 pounds
251 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.24 pounds
~0 Gs
Two magnetic products interact from a wider radius than a neodymium and metal combination. The connection of two magnets generates a stronger field and a wider radius of operation. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the pinch force is massive. The repulsion force is marginally weaker than the connection force, but still significant.
*Flux density in repulsion mode reaches ~0 Gs at the geometric center between the magnets (due to field cancellation).
Attention: Estimates refer to friction force of dual matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - precautionary measures
MW 40x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.5 cm
Hearing aid 10 Gs (1.0 mT) 13.0 cm
Mechanical watch 20 Gs (2.0 mT) 10.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 8.0 cm
Remote 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Extremely neodym field is a serious hazard to IT equipment as well as pacemakers. These neodymiums generate a field that destroys function of digital equipment. Notice: the unseen radiation passes through tissues and housings. Increased vigilance must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MW 40x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.63 km/h
(5.73 m/s)
 1.55 J
30 mm 30.32 km/h
(8.42 m/s)
 3.34 J
50 mm 38.73 km/h
(10.76 m/s)
 5.45 J
100 mm 54.71 km/h
(15.20 m/s)
 10.88 J
Neodymium magnets are prone to chipping – a strong collision with metal can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can trigger coating fragments or injury to fingers. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Surface protection spec
MW 40x10 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MW 40x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 38 700 Mx 387.0 µWb
Pc Coefficient 0.35 Low (Flat)
Flux value passing through the pole surface. Key data in coil applications and motors. Pc value defines the working geometry.

Table 11: Submerged application
MW 40x10 / N38

Environment Effective steel pull Effect
Air (land) 27.73 kg Standard
Water (riverbed) 31.75 kg
(+4.02 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet retains merely a fraction of its max power.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) severely reduces the holding force.

3. Heat tolerance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.35

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.

Engineering data and GPSR
Material specification
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
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: 010066-2026
Magnet Unit Converter
Pulling force
Field Strength
Input a figure in just one slot to see the conversion in the other fields right away.

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This product is an exceptionally strong rod magnet, composed of modern NdFeB material, which, with dimensions of Ø40x10 mm, guarantees the highest energy density. The MW 40x10 / N38 component is characterized by high dimensional repeatability and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 27.73 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 271.99 N with a weight of only 94.25 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure long-term durability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need even stronger magnets in the same volume (Ø40x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø40x10 mm, which, at a weight of 94.25 g, makes it an element with impressive magnetic energy density. The value of 271.99 N means that the magnet is capable of holding a weight many times exceeding its own mass of 94.25 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 10 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Advantages as well as disadvantages of neodymium magnets.

Benefits

Apart from their strong power, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • They retain their magnetic properties even under strong external field,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • Thanks to the option of accurate molding and adaptation to custom requirements, magnetic components can be modeled in a wide range of geometric configurations, which expands the range of possible applications,
  • Universal use in modern technologies – they are commonly used in HDD drives, electric motors, advanced medical instruments, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in miniature devices

Disadvantages

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited ability of making threads in the magnet and complex forms - recommended is cover - mounting mechanism.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small components of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Maximum lifting capacity of the magnet – what contributes to it?

Breakaway force was defined for optimal configuration, assuming:
  • using a plate made of low-carbon steel, serving as a magnetic yoke
  • with a cross-section no less than 10 mm
  • with an ground touching surface
  • under conditions of gap-free contact (surface-to-surface)
  • during pulling in a direction perpendicular to the plane
  • at ambient temperature room level

Practical aspects of lifting capacity – factors

Real force is affected by working environment parameters, including (from priority):
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick steel does not accept the full field, causing part of the power to be wasted into the air.
  • Steel type – mild steel gives the best results. Alloy admixtures lower magnetic properties and lifting capacity.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

H&S for magnets
This is not a toy

Absolutely store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets connecting inside the body are tragic.

Bone fractures

Big blocks can crush fingers instantly. Do not place your hand betwixt two strong magnets.

Mechanical processing

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

Do not overheat magnets

Keep cool. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).

Risk of cracking

NdFeB magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets leads to them breaking into shards.

Keep away from computers

Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Respect the power

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Nickel coating and allergies

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness appears, immediately stop working with magnets and wear gloves.

Precision electronics

A strong magnetic field interferes with the operation of compasses in phones and GPS navigation. Do not bring magnets close to a device to avoid damaging the sensors.

Pacemakers

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Warning! Want to know more? Check our post: Are neodymium magnets dangerous?