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MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

lamellar magnet

Catalog no 020397

GTIN/EAN: 5906301811909

5.00

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

15 g

Magnetization Direction

↑ axial

Load capacity

11.85 kg / 116.27 N

Magnetic Induction

321.37 mT / 3214 Gs

Coating

[NiCuNi] Nickel

check properties »

9.93 ZŁ with VAT / pcs + price for transport

8.07 ZŁ net + 23% VAT / pcs

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Technical of the product - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

properties
properties values
Cat. no. 020397
GTIN/EAN 5906301811909
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 40 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 15 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.85 kg / 116.27 N
Magnetic Induction ~ ? 321.37 mT / 3214 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x5x2[7/3.5] / 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 - data

Presented data constitute the result of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Treat these calculations as a reference point during assembly planning.

Table 1: Static force (pull vs gap) - characteristics
MPL 40x10x5x2[7/3.5] / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3212 Gs
321.2 mT
 11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
 dangerous!
1 mm 2791 Gs
279.1 mT
 8.95 kg / 19.73 LBS
8947.7 g / 87.8 N
 medium risk
2 mm 2358 Gs
235.8 mT
 6.38 kg / 14.08 LBS
6384.9 g / 62.6 N
 medium risk
3 mm 1965 Gs
196.5 mT
 4.43 kg / 9.77 LBS
4432.4 g / 43.5 N
 medium risk
5 mm 1360 Gs
136.0 mT
 2.12 kg / 4.68 LBS
2122.9 g / 20.8 N
 medium risk
10 mm 615 Gs
61.5 mT
 0.43 kg / 0.96 LBS
434.1 g / 4.3 N
 low risk
15 mm 329 Gs
32.9 mT
 0.12 kg / 0.27 LBS
124.5 g / 1.2 N
 low risk
20 mm 195 Gs
19.5 mT
 0.04 kg / 0.10 LBS
43.9 g / 0.4 N
 low risk
30 mm 83 Gs
8.3 mT
 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
 low risk
50 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 LBS
0.6 g / 0.0 N
 low risk
Grip strength decreases sharply with every subsequent millimeter of distance. Keep in mind that even the smallest gap (e.g., contamination, varnish, dust) noticeably weakens the grip. Magnetic products operate most effectively during direct contact; distance kills the power. Notice how quickly the load capacity drop, when the magnet does not adhere tightly to the steel surface. When planning the assembly, eliminate additional spacers.

Table 2: Sliding capacity (vertical surface)
MPL 40x10x5x2[7/3.5] / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.37 kg / 5.22 LBS
2370.0 g / 23.2 N
1 mm Stal (~0.2) 1.79 kg / 3.95 LBS
1790.0 g / 17.6 N
2 mm Stal (~0.2) 1.28 kg / 2.81 LBS
1276.0 g / 12.5 N
3 mm Stal (~0.2) 0.89 kg / 1.95 LBS
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.42 kg / 0.93 LBS
424.0 g / 4.2 N
10 mm Stal (~0.2) 0.09 kg / 0.19 LBS
86.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 LBS
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
This section shows the theoretical weight limit needed to start the sliding of the magnet downwards against a upright steel wall (considering typical friction coefficient). This parameter varies with the distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 40x10x5x2[7/3.5] / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.55 kg / 7.84 LBS
3555.0 g / 34.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.37 kg / 5.22 LBS
2370.0 g / 23.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.19 kg / 2.61 LBS
1185.0 g / 11.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.93 kg / 13.06 LBS
5925.0 g / 58.1 N
When hanging a holder on a upright wall (e.g., a board), it will maintain only approx. 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that magnets move down easier than they pull off. Planning a wall mount? Note that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the holder will slip down under a significantly smaller weight. Utilizing a rubberized coating can significantly increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 40x10x5x2[7/3.5] / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.59 kg / 1.31 LBS
592.5 g / 5.8 N
1 mm
13%
 1.48 kg / 3.27 LBS
1481.3 g / 14.5 N
2 mm
25%
 2.96 kg / 6.53 LBS
2962.5 g / 29.1 N
3 mm
38%
 4.44 kg / 9.80 LBS
4443.8 g / 43.6 N
5 mm
63%
 7.41 kg / 16.33 LBS
7406.3 g / 72.7 N
10 mm
100%
 11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
11 mm
100%
 11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
12 mm
100%
 11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
A thin metal plate is not enough to focus the entire magnetic field, which squanders power of the magnet. Should you attach a powerful product to a weak sheet, the flux will penetrate right through and the attraction force will be weaker. To squeeze the maximum of this magnet's potential, you require a sufficiently solid piece of metal. The saturation effect causes that on thin elements (e.g., car bodies), the holder holds weaker. We advise picking the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - power drop
MPL 40x10x5x2[7/3.5] / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.85 kg / 26.12 LBS
11850.0 g / 116.2 N
 OK
40 °C -2.2% 11.59 kg / 25.55 LBS
11589.3 g / 113.7 N
 OK
60 °C -4.4% 11.33 kg / 24.98 LBS
11328.6 g / 111.1 N
80 °C -6.6% 11.07 kg / 24.40 LBS
11067.9 g / 108.6 N
100 °C -28.8% 8.44 kg / 18.60 LBS
8437.2 g / 82.8 N
Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Watch out for overheating – excessive heat can irreversibly demagnetize this magnet. With every degree above norm, the magnet's force briefly decreases. Refrain from using this magnet in hot environments higher than its safe range. Ignoring the limit will cause destruction of magnetic properties.
*Important note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low Pc) may lose charge permanently at lower temperatures compared to rod magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MPL 40x10x5x2[7/3.5] / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 25.44 kg / 56.10 LBS
4 569 Gs
3.82 kg / 8.41 LBS
3817 g / 37.4 N
 N/A
1 mm 22.33 kg / 49.22 LBS
6 018 Gs
3.35 kg / 7.38 LBS
3349 g / 32.9 N
 20.09 kg / 44.30 LBS
~0 Gs
2 mm 19.21 kg / 42.36 LBS
5 582 Gs
2.88 kg / 6.35 LBS
2882 g / 28.3 N
 17.29 kg / 38.12 LBS
~0 Gs
3 mm 16.31 kg / 35.96 LBS
5 144 Gs
2.45 kg / 5.39 LBS
2447 g / 24.0 N
 14.68 kg / 32.36 LBS
~0 Gs
5 mm 11.45 kg / 25.23 LBS
4 309 Gs
1.72 kg / 3.78 LBS
1717 g / 16.8 N
 10.30 kg / 22.71 LBS
~0 Gs
10 mm 4.56 kg / 10.05 LBS
2 719 Gs
0.68 kg / 1.51 LBS
684 g / 6.7 N
 4.10 kg / 9.04 LBS
~0 Gs
20 mm 0.93 kg / 2.05 LBS
1 230 Gs
0.14 kg / 0.31 LBS
140 g / 1.4 N
 0.84 kg / 1.85 LBS
~0 Gs
50 mm 0.04 kg / 0.08 LBS
249 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.03 kg / 0.08 LBS
~0 Gs
60 mm 0.02 kg / 0.04 LBS
167 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.03 LBS
~0 Gs
70 mm 0.01 kg / 0.02 LBS
116 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.01 LBS
84 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.01 LBS
62 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
48 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums attract each other from a much further distance than a magnet and sheet combination. The setup of two magnets creates a more powerful interaction and a larger range of operation. Planning to create a strong closure? Apply two magnets instead of one magnet and a steel. Exercise caution that when bringing together two magnets, the collision energy is huge. The repulsion force is slightly lower than the attraction, but still large.
*The magnetic induction between like poles reaches ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Attention: Calculations refer to friction force of two matching magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 40x10x5x2[7/3.5] / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Timepiece 20 Gs (2.0 mT) 5.5 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field is a real danger to IT equipment and medical implants. These neodymiums produce a field that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field acts through matter and plastic. Increased vigilance must be taken by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MPL 40x10x5x2[7/3.5] / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.99 km/h
(8.05 m/s)
 0.49 J
30 mm 49.12 km/h
(13.64 m/s)
 1.40 J
50 mm 63.39 km/h
(17.61 m/s)
 2.33 J
100 mm 89.64 km/h
(24.90 m/s)
 4.65 J
NdFeB products are delicate – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or injury to skin. Hold the magnet firmly during mounting so it doesn't hit with great force against the steel surface. A collision at high speed ends with a crack of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Corrosion resistance
MPL 40x10x5x2[7/3.5] / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MPL 40x10x5x2[7/3.5] / N38

Parameter Value SI Unit / Description
Magnetic Flux 11 419 Mx 114.2 µWb
Pc Coefficient 0.31 Low (Flat)
Flux value passing through the magnet pole. Key data in coil applications and motors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 40x10x5x2[7/3.5] / N38

Environment Effective steel pull Effect
Air (land) 11.85 kg Standard
Water (riverbed) 13.57 kg
(+1.72 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)

*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

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

3. Temperature resistance

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.31

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%
Sustainability
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: 020397-2026
Quick Unit Converter
Pulling force
Field Strength
Simply complete one field, and the calculator fill in the rest instantly.

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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 40x10x5 mm and a weight of 15 g, guarantees premium class connection. This magnetic block with a force of 116.27 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is shifting the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 40x10x5x2[7/3.5] / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 40x10x5x2[7/3.5] / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 11.85 kg), they are ideal as closers 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.
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 40x10x5 mm, which, at a weight of 15 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 40x10x5 mm and a self-weight of 15 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros as well as cons of neodymium magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They are resistant to demagnetization induced by external disturbances,
  • A magnet with a shiny gold surface is more attractive,
  • Neodymium magnets ensure maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • In view of the option of flexible shaping and adaptation to individualized projects, neodymium magnets can be modeled in a wide range of geometric configurations, which increases their versatility,
  • Versatile presence in modern industrial fields – they are commonly used in mass storage devices, electric drive systems, medical devices, and complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited ability of producing threads in the magnet and complex shapes - recommended is cover - mounting mechanism.
  • Possible danger resulting from small fragments of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, tiny parts of these products can be problematic in diagnostics medical after entering the body.
  • Due to expensive raw materials, their price exceeds standard values,

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

Magnet power was defined for ideal contact conditions, including:
  • on a plate made of structural steel, optimally conducting the magnetic flux
  • with a cross-section of at least 10 mm
  • with an ideally smooth touching surface
  • with zero gap (without impurities)
  • during detachment in a direction vertical to the plane
  • at ambient temperature room level

Practical aspects of lifting capacity – factors

Effective lifting capacity impacted by specific conditions, such as (from most important):
  • Distance – existence of any layer (rust, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material composition – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
  • Smoothness – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate reduces the lifting capacity.

H&S for magnets
Risk of cracking

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.

Warning for heart patients

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Handling rules

Handle magnets consciously. Their huge power can surprise even experienced users. Stay alert and respect their power.

Pinching danger

Big blocks can smash fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.

Keep away from computers

Do not bring magnets near a wallet, laptop, or screen. The magnetism can destroy these devices and erase data from cards.

Keep away from electronics

Note: neodymium magnets generate a field that confuses sensitive sensors. Keep a separation from your phone, device, and GPS.

Heat sensitivity

Keep cool. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).

Dust is flammable

Fire warning: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.

Swallowing risk

Absolutely store magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are very dangerous.

Allergy Warning

A percentage of the population suffer from a hypersensitivity to nickel, which is the common plating for neodymium magnets. Frequent touching can result in an allergic reaction. We suggest wear safety gloves.

Security! Details about hazards in the article: Magnet Safety Guide.