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MW 12.5x2 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010014

GTIN/EAN: 5906301810131

5.00

Diameter Ø

12.5 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

1.84 g

Magnetization Direction

↑ axial

Load capacity

1.42 kg / 13.89 N

Magnetic Induction

188.88 mT / 1889 Gs

Coating

[NiCuNi] Nickel

see specifications »

0.935 ZŁ with VAT / pcs + price for transport

0.760 ZŁ net + 23% VAT / pcs

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Lifting power along with appearance of neodymium magnets can be estimated using our online calculation tool.

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Technical specification of the product - MW 12.5x2 / N38 - cylindrical magnet

Specification / characteristics - MW 12.5x2 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010014
GTIN/EAN 5906301810131
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 12.5 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 1.84 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.42 kg / 13.89 N
Magnetic Induction ~ ? 188.88 mT / 1889 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12.5x2 / 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

Technical analysis of the assembly - technical parameters

These information represent the result of a physical calculation. Values are based on models for the material Nd2Fe14B. Actual conditions might slightly differ. Use these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - power drop
MW 12.5x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1888 Gs
188.8 mT
 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
 low risk
1 mm 1703 Gs
170.3 mT
 1.16 kg / 2.55 LBS
1155.6 g / 11.3 N
 low risk
2 mm 1453 Gs
145.3 mT
 0.84 kg / 1.85 LBS
840.3 g / 8.2 N
 low risk
3 mm 1190 Gs
119.0 mT
 0.56 kg / 1.24 LBS
564.1 g / 5.5 N
 low risk
5 mm 752 Gs
75.2 mT
 0.23 kg / 0.50 LBS
225.0 g / 2.2 N
 low risk
10 mm 241 Gs
24.1 mT
 0.02 kg / 0.05 LBS
23.2 g / 0.2 N
 low risk
15 mm 96 Gs
9.6 mT
 0.00 kg / 0.01 LBS
3.7 g / 0.0 N
 low risk
20 mm 46 Gs
4.6 mT
 0.00 kg / 0.00 LBS
0.9 g / 0.0 N
 low risk
30 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 low risk
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
Grip strength drops sharply with every mm of spacing. Remember that every additional insulation layer (e.g., contamination, paint, rust) significantly weakens the grip. Neodymiums operate most effectively during direct contact; air break kills the force. See how flashily the load capacity drop, when the magnet does not touch tightly to the steel surface. When designing the arrangement, avoid redundant distances.

Table 2: Sliding capacity (wall)
MW 12.5x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.28 kg / 0.63 LBS
284.0 g / 2.8 N
1 mm Stal (~0.2) 0.23 kg / 0.51 LBS
232.0 g / 2.3 N
2 mm Stal (~0.2) 0.17 kg / 0.37 LBS
168.0 g / 1.6 N
3 mm Stal (~0.2) 0.11 kg / 0.25 LBS
112.0 g / 1.1 N
5 mm Stal (~0.2) 0.05 kg / 0.10 LBS
46.0 g / 0.5 N
10 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
This section indicates the estimated weight limit sufficient to initiate the sliding of the magnet downwards against a vertical metal surface (assuming standard friction coefficient). This value is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 12.5x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.43 kg / 0.94 LBS
426.0 g / 4.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.28 kg / 0.63 LBS
284.0 g / 2.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.14 kg / 0.31 LBS
142.0 g / 1.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.71 kg / 1.57 LBS
710.0 g / 7.0 N
When placing a element on a upright plane (e.g., a board), it will maintain barely about 1/5 of its nominal power. Gravitational force and a weak degree of grip influence the fact that magnets slip easier than they pop off the substrate. Want to create a wall mount? Consider that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will slide down under a much lighter load. Application of an anti-slip layer can effectively increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 12.5x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.14 kg / 0.31 LBS
142.0 g / 1.4 N
1 mm
25%
 0.36 kg / 0.78 LBS
355.0 g / 3.5 N
2 mm
50%
 0.71 kg / 1.57 LBS
710.0 g / 7.0 N
3 mm
75%
 1.07 kg / 2.35 LBS
1065.0 g / 10.4 N
5 mm
100%
 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
10 mm
100%
 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
11 mm
100%
 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
12 mm
100%
 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
A thin metal plate is incapable of take in the full magnetic flux, which wastes potential of the holder. If you mount a strong magnet to a thin surface, the magnetism 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 causes that on thin elements (e.g., car bodies), the magnet shows lower pull force. We recommend selecting the steel cross-section according to the table below.

Table 5: Thermal stability (stability) - thermal limit
MW 12.5x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
 OK
40 °C -2.2% 1.39 kg / 3.06 LBS
1388.8 g / 13.6 N
 OK
60 °C -4.4% 1.36 kg / 2.99 LBS
1357.5 g / 13.3 N
80 °C -6.6% 1.33 kg / 2.92 LBS
1326.3 g / 13.0 N
100 °C -28.8% 1.01 kg / 2.23 LBS
1011.0 g / 9.9 N
Classic neodymiums lose parameters past the thermal threshold. Watch out for overheating – heat can permanently damage this magnet. With increasing heat, the neodymium's capacity temporarily drops. Avoid using this magnet near heat sources exceeding its safe range. Ignoring the limit will cause irreversible degradation of magnetism.
*Technical advisory: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) risk losing magnetic properties sooner than taller cylinders. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MW 12.5x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.70 kg / 5.95 LBS
3 338 Gs
0.40 kg / 0.89 LBS
405 g / 4.0 N
 N/A
1 mm 2.47 kg / 5.45 LBS
3 616 Gs
0.37 kg / 0.82 LBS
371 g / 3.6 N
 2.23 kg / 4.91 LBS
~0 Gs
2 mm 2.20 kg / 4.84 LBS
3 407 Gs
0.33 kg / 0.73 LBS
329 g / 3.2 N
 1.98 kg / 4.36 LBS
~0 Gs
3 mm 1.89 kg / 4.18 LBS
3 165 Gs
0.28 kg / 0.63 LBS
284 g / 2.8 N
 1.71 kg / 3.76 LBS
~0 Gs
5 mm 1.32 kg / 2.91 LBS
2 640 Gs
0.20 kg / 0.44 LBS
198 g / 1.9 N
 1.19 kg / 2.62 LBS
~0 Gs
10 mm 0.43 kg / 0.94 LBS
1 503 Gs
0.06 kg / 0.14 LBS
64 g / 0.6 N
 0.38 kg / 0.85 LBS
~0 Gs
20 mm 0.04 kg / 0.10 LBS
483 Gs
0.01 kg / 0.01 LBS
7 g / 0.1 N
 0.04 kg / 0.09 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
51 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
31 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
20 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
14 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
10 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
7 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products attract each other from a much further distance than a neodymium and metal combination. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of action. Want to build a strong closure? Apply two magnets instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the collision energy is massive. The levitation is a bit weaker than the attraction, but still large.
*Flux density in repulsion mode reaches ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Important: Figures apply to sliding force of a pair of same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - precautionary measures
MW 12.5x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.5 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Mobile device 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field is a real danger to electronic devices as well as pacemakers. These NdFeB products generate a flux that destroys function of sensitive medical devices. Notice: the unseen radiation penetrates the body and glass. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MW 12.5x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.30 km/h
(7.86 m/s)
 0.06 J
30 mm 48.53 km/h
(13.48 m/s)
 0.17 J
50 mm 62.65 km/h
(17.40 m/s)
 0.28 J
100 mm 88.60 km/h
(24.61 m/s)
 0.56 J
Magnetic elements are delicate – a violent impact against metal risks their cracking. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or injury to skin. Be sure to control the product during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the neodymium. Use safety goggles when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 12.5x2 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 12.5x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 810 Mx 28.1 µWb
Pc Coefficient 0.24 Low (Flat)
Flux value emitted by the pole surface. Key data for generator designers and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MW 12.5x2 / N38

Environment Effective steel pull Effect
Air (land) 1.42 kg Standard
Water (riverbed) 1.63 kg
(+0.21 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Warning: On a vertical surface, the magnet holds only approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.24

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
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%
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: 010014-2026
Magnet Unit Converter
Force (pull)
Magnetic Induction
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This product is an extremely powerful cylinder magnet, produced from durable NdFeB material, which, with dimensions of Ø12.5x2 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 1.42 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 13.89 N with a weight of only 1.84 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need the strongest magnets in the same volume (Ø12.5x2), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 12.5 mm and height 2 mm. The key parameter here is the holding force amounting to approximately 1.42 kg (force ~13.89 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 2 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.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after around 10 years it decreases only by ~1% (theoretically),
  • Magnets effectively protect themselves against demagnetization caused by foreign field sources,
  • In other words, due to the smooth finish of nickel, the element is aesthetically pleasing,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Thanks to flexibility in designing and the capacity to modify to client solutions,
  • Key role in electronics industry – they serve a role in computer drives, brushless drives, medical equipment, as well as complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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, in case of application outdoors
  • Limited possibility of producing threads in the magnet and complex forms - preferred is cover - mounting mechanism.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these products are able to complicate diagnosis medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Best holding force of the magnet in ideal parameters – what it depends on?

Information about lifting capacity was determined for ideal contact conditions, including:
  • with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • whose thickness equals approx. 10 mm
  • characterized by smoothness
  • under conditions of ideal adhesion (surface-to-surface)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature room level

Determinants of lifting force in real conditions

In real-world applications, the actual lifting capacity is determined by many variables, presented from most significant:
  • Distance (between the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
  • Direction of force – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Chemical composition of the base – low-carbon steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
  • Heat – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was measured using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet and the plate reduces the load capacity.

Safe handling of NdFeB magnets
Nickel allergy

Nickel alert: The Ni-Cu-Ni coating contains nickel. If an allergic reaction appears, immediately stop handling magnets and wear gloves.

Respect the power

Handle magnets consciously. Their huge power can shock even professionals. Be vigilant and do not underestimate their force.

Warning for heart patients

For implant holders: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or request help to handle the magnets.

No play value

Only for adults. Tiny parts pose a choking risk, leading to serious injuries. Store away from kids and pets.

Electronic hazard

Device Safety: Strong magnets can ruin payment cards and delicate electronics (pacemakers, hearing aids, mechanical watches).

Maximum temperature

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

Magnet fragility

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Impact of two magnets leads to them cracking into shards.

Combustion hazard

Combustion risk: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

Finger safety

Risk of injury: The pulling power is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Impact on smartphones

Remember: neodymium magnets generate a field that disrupts precision electronics. Keep a safe distance from your phone, tablet, and navigation systems.

Attention! Want to know more? Read our article: Why are neodymium magnets dangerous?