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MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

lamellar magnet

Catalog no 020159

GTIN/EAN: 5906301811657

5.00
Load capacity 7.52 kg / 73.80 N Magnetic Induction 168.28 mT / 1683 Gs
length
40 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
24 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
technical specifications »

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Parameters and structure of neodymium magnets can be analyzed with our force calculator.

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Product card - MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

Specification / characteristics - MPL 40x20x4x2[7/3.5] / N38 - lamellar magnet

properties
properties values
Cat. no. 020159
GTIN/EAN 5906301811657
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 20 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 24 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.52 kg / 73.80 N
Magnetic Induction ~ ? 168.28 mT / 1683 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x20x4x2[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

Engineering simulation of the magnet - technical parameters

These values represent the outcome of a mathematical analysis. Results rely on models for the material Nd2Fe14B. Actual conditions may deviate from the simulation results. Treat these data as a supplementary guide for designers.

Table 1: Static pull force (pull vs gap) - power drop
MPL 40x20x4x2[7/3.5] / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1683 Gs
168.3 mT
 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
 strong
1 mm 1613 Gs
161.3 mT
 6.91 kg / 15.24 lbs
6913.8 g / 67.8 N
 strong
2 mm 1524 Gs
152.4 mT
 6.17 kg / 13.61 lbs
6172.9 g / 60.6 N
 strong
3 mm 1423 Gs
142.3 mT
 5.38 kg / 11.86 lbs
5379.4 g / 52.8 N
 strong
5 mm 1207 Gs
120.7 mT
 3.87 kg / 8.53 lbs
3869.8 g / 38.0 N
 strong
10 mm 744 Gs
74.4 mT
 1.47 kg / 3.24 lbs
1469.3 g / 14.4 N
 safe
15 mm 455 Gs
45.5 mT
 0.55 kg / 1.21 lbs
550.7 g / 5.4 N
 safe
20 mm 288 Gs
28.8 mT
 0.22 kg / 0.49 lbs
220.3 g / 2.2 N
 safe
30 mm 129 Gs
12.9 mT
 0.04 kg / 0.10 lbs
44.4 g / 0.4 N
 safe
50 mm 38 Gs
3.8 mT
 0.00 kg / 0.01 lbs
3.8 g / 0.0 N
 safe
Pulling power drops significantly with every mm of distance. Keep in mind that even the smallest gap (e.g., dirt, varnish, dust) significantly weakens the grip. Magnets operate strongest at the point of direct contact; distance nullifies the power. Analyze how quickly the parameters plummet, when the magnet does not touch tightly to the metal substrate. When calculating the mounting, discard additional spacers.

Table 2: Vertical load (wall)
MPL 40x20x4x2[7/3.5] / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.50 kg / 3.32 lbs
1504.0 g / 14.8 N
1 mm Stal (~0.2) 1.38 kg / 3.05 lbs
1382.0 g / 13.6 N
2 mm Stal (~0.2) 1.23 kg / 2.72 lbs
1234.0 g / 12.1 N
3 mm Stal (~0.2) 1.08 kg / 2.37 lbs
1076.0 g / 10.6 N
5 mm Stal (~0.2) 0.77 kg / 1.71 lbs
774.0 g / 7.6 N
10 mm Stal (~0.2) 0.29 kg / 0.65 lbs
294.0 g / 2.9 N
15 mm Stal (~0.2) 0.11 kg / 0.24 lbs
110.0 g / 1.1 N
20 mm Stal (~0.2) 0.04 kg / 0.10 lbs
44.0 g / 0.4 N
30 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below calculates the theoretical holding capacity necessary to start the sliding of the magnet vertically on a upright metal surface (assuming typical friction). The holding force is a function of the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MPL 40x20x4x2[7/3.5] / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.26 kg / 4.97 lbs
2256.0 g / 22.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.50 kg / 3.32 lbs
1504.0 g / 14.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.75 kg / 1.66 lbs
752.0 g / 7.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.76 kg / 8.29 lbs
3760.0 g / 36.9 N
When placing a holder on a vertical wall (e.g., a board), it will maintain only about 1/5 of nominal attraction strength. Gravity as well as a low friction coefficient influence the fact that holders slip faster than they detach. Planning a vertical fastening? Remember that the shear force is noticeably lower than the maximum static pull force. On a smooth steel, the element will give way down under a noticeably lighter load. Using a rubber pad can significantly improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 40x20x4x2[7/3.5] / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.75 kg / 1.66 lbs
752.0 g / 7.4 N
1 mm
25%
 1.88 kg / 4.14 lbs
1880.0 g / 18.4 N
2 mm
50%
 3.76 kg / 8.29 lbs
3760.0 g / 36.9 N
3 mm
75%
 5.64 kg / 12.43 lbs
5640.0 g / 55.3 N
5 mm
100%
 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
10 mm
100%
 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
11 mm
100%
 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
12 mm
100%
 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
A thin sheet is unable to take in the full magnetic flux, which weakens actual performance of the holder. If you install a neodymium to a too thin substrate, the field will penetrate right through and the pull force will drop sharply. To utilize the maximum of this neodymium's potential, you need a suitably thick element of metal. The material oversaturation causes that on thin elements (e.g., car bodies), the magnet holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Working in heat (stability) - power drop
MPL 40x20x4x2[7/3.5] / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.52 kg / 16.58 lbs
7520.0 g / 73.8 N
 OK
40 °C -2.2% 7.35 kg / 16.21 lbs
7354.6 g / 72.1 N
 OK
60 °C -4.4% 7.19 kg / 15.85 lbs
7189.1 g / 70.5 N
80 °C -6.6% 7.02 kg / 15.48 lbs
7023.7 g / 68.9 N
100 °C -28.8% 5.35 kg / 11.80 lbs
5354.2 g / 52.5 N
Ordinary NdFeB products irreversibly lose parameters after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently damage this product. With increasing heat, the magnet's capacity temporarily lowers. Avoid using this magnet close to ovens higher than its safe range. Ignoring the limit will cause destruction of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently sooner than long magnets. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 40x20x4x2[7/3.5] / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.96 kg / 30.78 lbs
2 997 Gs
2.09 kg / 4.62 lbs
2094 g / 20.5 N
 N/A
1 mm 13.44 kg / 29.64 lbs
3 302 Gs
2.02 kg / 4.45 lbs
2017 g / 19.8 N
 12.10 kg / 26.68 lbs
~0 Gs
2 mm 12.84 kg / 28.30 lbs
3 227 Gs
1.93 kg / 4.25 lbs
1926 g / 18.9 N
 11.55 kg / 25.47 lbs
~0 Gs
3 mm 12.17 kg / 26.83 lbs
3 142 Gs
1.83 kg / 4.02 lbs
1826 g / 17.9 N
 10.95 kg / 24.15 lbs
~0 Gs
5 mm 10.73 kg / 23.65 lbs
2 950 Gs
1.61 kg / 3.55 lbs
1609 g / 15.8 N
 9.66 kg / 21.29 lbs
~0 Gs
10 mm 7.19 kg / 15.84 lbs
2 414 Gs
1.08 kg / 2.38 lbs
1078 g / 10.6 N
 6.47 kg / 14.26 lbs
~0 Gs
20 mm 2.73 kg / 6.01 lbs
1 487 Gs
0.41 kg / 0.90 lbs
409 g / 4.0 N
 2.46 kg / 5.41 lbs
~0 Gs
50 mm 0.18 kg / 0.39 lbs
379 Gs
0.03 kg / 0.06 lbs
27 g / 0.3 N
 0.16 kg / 0.35 lbs
~0 Gs
60 mm 0.08 kg / 0.18 lbs
259 Gs
0.01 kg / 0.03 lbs
12 g / 0.1 N
 0.07 kg / 0.16 lbs
~0 Gs
70 mm 0.04 kg / 0.09 lbs
183 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.04 kg / 0.08 lbs
~0 Gs
80 mm 0.02 kg / 0.05 lbs
133 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
90 mm 0.01 kg / 0.03 lbs
99 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
76 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products interact from a much further distance than a magnet and steel combination. The connection of two magnets produces a massive flux and a further horizon of action. Planning to create a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the collision energy is massive. The repulsion force is marginally weaker than the attraction, but still large.
*The magnetic induction for N-N configuration reaches ~0 Gs at the geometric center of the gap (resulting from vector opposition).
* Figures show sliding force of two same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - precautionary measures
MPL 40x20x4x2[7/3.5] / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.5 cm
Hearing aid 10 Gs (1.0 mT) 8.5 cm
Mechanical watch 20 Gs (2.0 mT) 6.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.0 cm
Car key 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field is a serious hazard to electronics and medical implants. These neodymiums generate a flux that disrupts operation of digital equipment. Remember: the unseen radiation penetrates the body and plastic. Exceptional care must be exercised by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MPL 40x20x4x2[7/3.5] / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.94 km/h
(5.82 m/s)
 0.41 J
30 mm 22.76 km/h
(6.32 m/s)
 0.48 J
50 mm 22.83 km/h
(6.34 m/s)
 0.48 J
100 mm 22.85 km/h
(6.35 m/s)
 0.48 J
Neodymium magnets are delicate – a collision with steel can result in shattering. Watch the impact speed – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or injury to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Coating parameters (durability)
MPL 40x20x4x2[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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MPL 40x20x4x2[7/3.5] / N38

Parameter Value SI Unit / Description
Magnetic Flux 15 299 Mx 153.0 µWb
Pc Coefficient 0.19 Low (Flat)
Total magnetic flux passing through the magnet pole. Key data for generator designers and motors. Pc value defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 40x20x4x2[7/3.5] / N38

Environment Effective steel pull Effect
Air (land) 7.52 kg Standard
Water (riverbed) 8.61 kg
(+1.09 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.

1. Vertical hold

*Warning: On a vertical surface, the magnet retains only ~20% of its perpendicular strength.

2. Steel saturation

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

3. Thermal stability

*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) = 0.19

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

Chemical composition

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: 020159-2026
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Model MPL 40x20x4x2[7/3.5] / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 73.80 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 40x20x4x2[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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 40x20x4x2[7/3.5] / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 20 mm (width), and 4 mm (thickness). It is a magnetic block with dimensions 40x20x4 mm and a self-weight of 24 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Advantages

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • Neodymium magnets prove to be extremely resistant to magnetic field loss caused by external magnetic fields,
  • In other words, due to the smooth layer of gold, the element is aesthetically pleasing,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures reaching 230°C and above...
  • Thanks to freedom in shaping and the capacity to modify to individual projects,
  • Fundamental importance in advanced technology sectors – they serve a role in hard drives, electric drive systems, medical equipment, as well as complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Weaknesses

What to avoid - cons of neodymium magnets: tips and applications.
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of creating threads in the magnet and complicated forms - recommended is casing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small components of these devices can be problematic in diagnostics medical after entering the body.
  • Due to complex production process, their price is higher than average,

Holding force characteristics

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

The specified lifting capacity represents the limit force, obtained under ideal test conditions, namely:
  • on a block made of mild steel, perfectly concentrating the magnetic flux
  • whose transverse dimension is min. 10 mm
  • with an ground touching surface
  • without any air gap between the magnet and steel
  • under axial force direction (90-degree angle)
  • at temperature room level

Magnet lifting force in use – key factors

In real-world applications, the actual holding force results from many variables, listed from the most important:
  • Clearance – the presence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Steel thickness – too thin plate causes magnetic saturation, causing part of the flux to be wasted to the other side.
  • Chemical composition of the base – mild steel gives the best results. Higher carbon content lower magnetic permeability and lifting capacity.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the holding force.

Safe handling of NdFeB magnets
Electronic devices

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

Maximum temperature

Watch the temperature. Exposing the magnet to high heat will permanently weaken its properties and strength.

Do not drill into magnets

Machining of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Life threat

People with a pacemaker have to keep an large gap from magnets. The magnetism can interfere with the operation of the implant.

Keep away from electronics

Be aware: rare earth magnets produce a field that confuses precision electronics. Maintain a safe distance from your mobile, device, and navigation systems.

Bone fractures

Big blocks can crush fingers instantly. Never place your hand betwixt two strong magnets.

Material brittleness

Watch out for shards. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

Adults only

Always store magnets away from children. Choking hazard is significant, and the consequences of magnets connecting inside the body are very dangerous.

Nickel allergy

Some people suffer from a hypersensitivity to Ni, which is the common plating for neodymium magnets. Frequent touching might lead to skin redness. We suggest use protective gloves.

Safe operation

Before starting, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Danger! Looking for details? Check our post: Why are neodymium magnets dangerous?