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MW 5x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010084

GTIN/EAN: 5906301810834

5.00

Diameter Ø

5 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

2.21 g

Magnetization Direction

↑ axial

Load capacity

0.48 kg / 4.68 N

Magnetic Induction

610.03 mT / 6100 Gs

Coating

[NiCuNi] Nickel

check specifications »

1.107 ZŁ with VAT / pcs + price for transport

0.900 ZŁ net + 23% VAT / pcs

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Force as well as appearance of a neodymium magnet can be verified on our modular calculator.

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Product card - MW 5x15 / N38 - cylindrical magnet

Specification / characteristics - MW 5x15 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010084
GTIN/EAN 5906301810834
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 5 mm [±0,1 mm]
Height 15 mm [±0,1 mm]
Weight 2.21 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.48 kg / 4.68 N
Magnetic Induction ~ ? 610.03 mT / 6100 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 5x15 / 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 simulation of the product - technical parameters

These values are the direct effect of a physical calculation. Values were calculated on models for the material Nd2Fe14B. Real-world performance may deviate from the simulation results. Treat these calculations as a reference point for designers.

Table 1: Static force (force vs gap) - characteristics
MW 5x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6091 Gs
609.1 mT
 0.48 kg / 1.06 pounds
480.0 g / 4.7 N
 weak grip
1 mm 3823 Gs
382.3 mT
 0.19 kg / 0.42 pounds
189.1 g / 1.9 N
 weak grip
2 mm 2261 Gs
226.1 mT
 0.07 kg / 0.15 pounds
66.1 g / 0.6 N
 weak grip
3 mm 1378 Gs
137.8 mT
 0.02 kg / 0.05 pounds
24.6 g / 0.2 N
 weak grip
5 mm 607 Gs
60.7 mT
 0.00 kg / 0.01 pounds
4.8 g / 0.0 N
 weak grip
10 mm 154 Gs
15.4 mT
 0.00 kg / 0.00 pounds
0.3 g / 0.0 N
 weak grip
15 mm 63 Gs
6.3 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 weak grip
20 mm 32 Gs
3.2 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
30 mm 12 Gs
1.2 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
50 mm 3 Gs
0.3 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 weak grip
Magnetic force drops drastically per each millimeter of distance. Keep in mind that even a microscopic distance (e.g., dirt, varnish, veneer) noticeably diminishes the holding power. Magnets operate strongest at the point of direct contact; distance drastically cuts the power. See how quickly the parameters plummet, when the product does not touch directly to the steel surface. When calculating the arrangement, avoid unnecessary gaps.

Table 2: Slippage hold (vertical surface)
MW 5x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.10 kg / 0.21 pounds
96.0 g / 0.9 N
1 mm Stal (~0.2) 0.04 kg / 0.08 pounds
38.0 g / 0.4 N
2 mm Stal (~0.2) 0.01 kg / 0.03 pounds
14.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The following data indicates the estimated weight limit required to start the shifting of the magnet vertically against a upright steel wall (assuming typical friction coefficient). This value depends on the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MW 5x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.14 kg / 0.32 pounds
144.0 g / 1.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.10 kg / 0.21 pounds
96.0 g / 0.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.05 kg / 0.11 pounds
48.0 g / 0.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.24 kg / 0.53 pounds
240.0 g / 2.4 N
When mounting a magnet on a upright surface (e.g., a board), it will maintain only approx. 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient mean that products slide down easier than they pop off the substrate. Want to create a wall mount? Note that the shear force is significantly lower than the maximum static pull force. On a painted metal, the magnet will give way down under a significantly smaller cargo. Application of an anti-slip coating can drastically improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 5x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.05 kg / 0.11 pounds
48.0 g / 0.5 N
1 mm
25%
 0.12 kg / 0.26 pounds
120.0 g / 1.2 N
2 mm
50%
 0.24 kg / 0.53 pounds
240.0 g / 2.4 N
3 mm
75%
 0.36 kg / 0.79 pounds
360.0 g / 3.5 N
5 mm
100%
 0.48 kg / 1.06 pounds
480.0 g / 4.7 N
10 mm
100%
 0.48 kg / 1.06 pounds
480.0 g / 4.7 N
11 mm
100%
 0.48 kg / 1.06 pounds
480.0 g / 4.7 N
12 mm
100%
 0.48 kg / 1.06 pounds
480.0 g / 4.7 N
A too thin steel is not enough to take in the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a weak sheet, the magnetism will penetrate right through and the holding will be smaller. To squeeze the maximum of this magnet's power, you require a sufficiently solid element of metal. The saturation phenomenon causes that on thin elements (e.g., thin profiles), the holder shows lower pull force. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (material behavior) - power drop
MW 5x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.48 kg / 1.06 pounds
480.0 g / 4.7 N
 OK
40 °C -2.2% 0.47 kg / 1.03 pounds
469.4 g / 4.6 N
 OK
60 °C -4.4% 0.46 kg / 1.01 pounds
458.9 g / 4.5 N
 OK
80 °C -6.6% 0.45 kg / 0.99 pounds
448.3 g / 4.4 N
100 °C -28.8% 0.34 kg / 0.75 pounds
341.8 g / 3.4 N
Classic neodymiums irreversibly lose power above the temperature limit. Avoid high temperatures – high temperature can irreversibly damage this product. With every degree above norm, the magnet's power momentarily lowers. Avoid using this product near heat sources higher than its working range. Too high temperature will cause destruction of magnetism.
*Engineering note: Heat tolerance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low Pc) are more susceptible to demagnetization under lower heat stress than long magnets. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 5x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.49 kg / 9.90 pounds
6 154 Gs
0.67 kg / 1.49 pounds
674 g / 6.6 N
 N/A
1 mm 2.91 kg / 6.42 pounds
9 810 Gs
0.44 kg / 0.96 pounds
437 g / 4.3 N
 2.62 kg / 5.78 pounds
~0 Gs
2 mm 1.77 kg / 3.90 pounds
7 646 Gs
0.27 kg / 0.59 pounds
265 g / 2.6 N
 1.59 kg / 3.51 pounds
~0 Gs
3 mm 1.05 kg / 2.31 pounds
5 880 Gs
0.16 kg / 0.35 pounds
157 g / 1.5 N
 0.94 kg / 2.08 pounds
~0 Gs
5 mm 0.37 kg / 0.82 pounds
3 507 Gs
0.06 kg / 0.12 pounds
56 g / 0.5 N
 0.34 kg / 0.74 pounds
~0 Gs
10 mm 0.04 kg / 0.10 pounds
1 213 Gs
0.01 kg / 0.01 pounds
7 g / 0.1 N
 0.04 kg / 0.09 pounds
~0 Gs
20 mm 0.00 kg / 0.01 pounds
309 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
37 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
24 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
16 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
11 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
8 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
6 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a much further distance than a magnet and sheet setup. The connection of two magnets generates a stronger field and a further horizon of operation. Planning to create a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Remember that when bringing together two magnets, the pinch force is extreme. The repulsion force is marginally weaker than the attraction, but still significant.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
Attention: Figures refer to sliding force of two identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - warnings
MW 5x15 / 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) 2.5 cm
Mobile device 40 Gs (4.0 mT) 2.0 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
Extremely neodym field poses a serious hazard to IT equipment as well as pacemakers. These neodymiums produce a flux that disrupts operation of digital equipment. Be aware: the invisible magnetic field passes through tissues and glass. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MW 5x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 14.87 km/h
(4.13 m/s)
 0.02 J
30 mm 25.74 km/h
(7.15 m/s)
 0.06 J
50 mm 33.23 km/h
(9.23 m/s)
 0.09 J
100 mm 47.00 km/h
(13.06 m/s)
 0.19 J
Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Impact energy can trigger coating fragments or injury to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the steel surface. A collision at high speed ends with a crack of the magnet. Wear eye protection when handling with large magnets.

Table 9: Surface protection spec
MW 5x15 / 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 (Pc)
MW 5x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 382 Mx 13.8 µWb
Pc Coefficient 1.38 High (Stable)
Total magnetic flux passing through the pole surface. Key data for generator designers and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MW 5x15 / N38

Environment Effective steel pull Effect
Air (land) 0.48 kg Standard
Water (riverbed) 0.55 kg
(+0.07 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

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

2. Steel saturation

*Thin metal sheet (e.g. computer case) drastically weakens the holding force.

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.38

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
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%
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: 010084-2026
Quick Unit Converter
Force (pull)
Field Strength
Simply complete one field, and the converter fill in everything else automatically.

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This product is an exceptionally strong cylinder magnet, composed of advanced NdFeB material, which, with dimensions of Ø5x15 mm, guarantees maximum efficiency. The MW 5x15 / N38 component boasts an accuracy of ±0.1mm and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 0.48 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 4.68 N with a weight of only 2.21 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 5.1 mm) using two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need the strongest magnets in the same volume (Ø5x15), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 5 mm and height 15 mm. The key parameter here is the lifting capacity amounting to approximately 0.48 kg (force ~4.68 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 15 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable 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 through the diameter if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
  • Neodymium magnets prove to be remarkably resistant to loss of magnetic properties caused by external interference,
  • The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • 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 flexibility in shaping and the ability to customize to unusual requirements,
  • Significant place in high-tech industry – they are commonly used in hard drives, electric drive systems, advanced medical instruments, also multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • At strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's 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
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • We recommend casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these products are able to complicate diagnosis medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

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

The specified lifting capacity concerns the maximum value, measured under optimal environment, meaning:
  • using a base made of low-carbon steel, functioning as a circuit closing element
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by even structure
  • with direct contact (no impurities)
  • for force acting at a right angle (in the magnet axis)
  • at temperature room level

Key elements affecting lifting force

In real-world applications, the actual lifting capacity results from many variables, listed from crucial:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin steel causes magnetic saturation, causing part of the flux to be lost into the air.
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Safe handling of neodymium magnets
Implant safety

Warning for patients: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

This is not a toy

These products are not intended for children. Swallowing multiple magnets can lead to them pinching intestinal walls, which poses a severe health hazard and necessitates immediate surgery.

Threat to electronics

Powerful magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Permanent damage

Keep cool. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Crushing force

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

Eye protection

Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Respect the power

Exercise caution. Rare earth magnets act from a long distance and connect with massive power, often quicker than you can move away.

Sensitization to coating

A percentage of the population have a contact allergy to nickel, which is the standard coating for neodymium magnets. Frequent touching can result in a rash. We recommend wear safety gloves.

Precision electronics

GPS units and mobile phones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Fire risk

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

Danger! Need more info? Check our post: Why are neodymium magnets dangerous?