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MW 40x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010069

GTIN/EAN: 5906301810681

5.00

Diameter Ø

40 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

75.4 g

Magnetization Direction

↑ axial

Load capacity

20.43 kg / 200.39 N

Magnetic Induction

230.22 mT / 2302 Gs

Coating

[NiCuNi] Nickel

see specifications »

31.27 ZŁ with VAT / pcs + price for transport

25.42 ZŁ net + 23% VAT / pcs

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Strength and shape of a neodymium magnet can be checked using our online calculation tool.

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Technical data of the product - MW 40x8 / N38 - cylindrical magnet

Specification / characteristics - MW 40x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010069
GTIN/EAN 5906301810681
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 40 mm [±0,1 mm]
Height 8 mm [±0,1 mm]
Weight 75.4 g
Magnetization Direction ↑ axial
Load capacity ~ ? 20.43 kg / 200.39 N
Magnetic Induction ~ ? 230.22 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x8 / 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 modeling of the assembly - report

Presented information are the outcome of a physical simulation. Values are based on algorithms for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Please consider these data as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - characteristics
MW 40x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2302 Gs
230.2 mT
 20.43 kg / 45.04 lbs
20430.0 g / 200.4 N
 dangerous!
1 mm 2235 Gs
223.5 mT
 19.25 kg / 42.44 lbs
19252.0 g / 188.9 N
 dangerous!
2 mm 2156 Gs
215.6 mT
 17.92 kg / 39.50 lbs
17917.4 g / 175.8 N
 dangerous!
3 mm 2068 Gs
206.8 mT
 16.49 kg / 36.36 lbs
16490.6 g / 161.8 N
 dangerous!
5 mm 1875 Gs
187.5 mT
 13.56 kg / 29.89 lbs
13556.7 g / 133.0 N
 dangerous!
10 mm 1375 Gs
137.5 mT
 7.29 kg / 16.07 lbs
7287.4 g / 71.5 N
 medium risk
15 mm 959 Gs
95.9 mT
 3.54 kg / 7.81 lbs
3542.3 g / 34.8 N
 medium risk
20 mm 661 Gs
66.1 mT
 1.68 kg / 3.71 lbs
1684.9 g / 16.5 N
 safe
30 mm 328 Gs
32.8 mT
 0.41 kg / 0.91 lbs
414.2 g / 4.1 N
 safe
50 mm 105 Gs
10.5 mT
 0.04 kg / 0.09 lbs
42.3 g / 0.4 N
 safe
Grip strength drops sharply with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., dirt, paint, veneer) noticeably weakens the grip. Magnets operate optimally in perfect adhesion; air break weakens the force. Observe how flashily the pull force drop, when the magnet does not touch directly to the steel surface. When designing the mounting, avoid redundant distances.

Table 2: Sliding load (wall)
MW 40x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.09 kg / 9.01 lbs
4086.0 g / 40.1 N
1 mm Stal (~0.2) 3.85 kg / 8.49 lbs
3850.0 g / 37.8 N
2 mm Stal (~0.2) 3.58 kg / 7.90 lbs
3584.0 g / 35.2 N
3 mm Stal (~0.2) 3.30 kg / 7.27 lbs
3298.0 g / 32.4 N
5 mm Stal (~0.2) 2.71 kg / 5.98 lbs
2712.0 g / 26.6 N
10 mm Stal (~0.2) 1.46 kg / 3.21 lbs
1458.0 g / 14.3 N
15 mm Stal (~0.2) 0.71 kg / 1.56 lbs
708.0 g / 6.9 N
20 mm Stal (~0.2) 0.34 kg / 0.74 lbs
336.0 g / 3.3 N
30 mm Stal (~0.2) 0.08 kg / 0.18 lbs
82.0 g / 0.8 N
50 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
The following data shows the theoretical holding capacity needed to initiate the sliding of the magnet vertically against a vertical steel wall (considering typical friction). This value is relative to the air gap between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 40x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
6.13 kg / 13.51 lbs
6129.0 g / 60.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.09 kg / 9.01 lbs
4086.0 g / 40.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.04 kg / 4.50 lbs
2043.0 g / 20.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.22 kg / 22.52 lbs
10215.0 g / 100.2 N
When hanging a magnet on a vertical wall (e.g., a car body), it you can count on just approx. 1/5 of its nominal power. Gravity and a low friction coefficient influence the fact that magnets slip easier than they detach. Want to create a vertical fastening? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the holder will slip down under a much lighter load. Application of an anti-slip pad can significantly increase the grip.

Table 4: Material efficiency (saturation) - power losses
MW 40x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.02 kg / 2.25 lbs
1021.5 g / 10.0 N
1 mm
13%
 2.55 kg / 5.63 lbs
2553.8 g / 25.1 N
2 mm
25%
 5.11 kg / 11.26 lbs
5107.5 g / 50.1 N
3 mm
38%
 7.66 kg / 16.89 lbs
7661.3 g / 75.2 N
5 mm
63%
 12.77 kg / 28.15 lbs
12768.8 g / 125.3 N
10 mm
100%
 20.43 kg / 45.04 lbs
20430.0 g / 200.4 N
11 mm
100%
 20.43 kg / 45.04 lbs
20430.0 g / 200.4 N
12 mm
100%
 20.43 kg / 45.04 lbs
20430.0 g / 200.4 N
A thin sheet is incapable of absorb the full magnetic flux, which squanders power of the holder. If you mount a strong magnet to a thin surface, the flux will pass 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 means that on sheet metal structures (e.g., thin profiles), the magnet holds weaker. We suggest choosing the steel dimension according to the table below.

Table 5: Working in heat (stability) - thermal limit
MW 40x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 20.43 kg / 45.04 lbs
20430.0 g / 200.4 N
 OK
40 °C -2.2% 19.98 kg / 44.05 lbs
19980.5 g / 196.0 N
 OK
60 °C -4.4% 19.53 kg / 43.06 lbs
19531.1 g / 191.6 N
80 °C -6.6% 19.08 kg / 42.07 lbs
19081.6 g / 187.2 N
100 °C -28.8% 14.55 kg / 32.07 lbs
14546.2 g / 142.7 N
Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Watch out for overheating – excessive heat can permanently damage this product. As the temperature rises, the neodymium's force briefly lowers. Refrain from using this magnet near heat sources higher than its safe range. Ignoring the limit will cause irreversible degradation of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) are more susceptible to demagnetization at lower temperatures than taller cylinders. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field range
MW 40x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 41.05 kg / 90.51 lbs
3 871 Gs
6.16 kg / 13.58 lbs
6158 g / 60.4 N
 N/A
1 mm 39.92 kg / 88.02 lbs
4 540 Gs
5.99 kg / 13.20 lbs
5989 g / 58.7 N
 35.93 kg / 79.22 lbs
~0 Gs
2 mm 38.69 kg / 85.29 lbs
4 469 Gs
5.80 kg / 12.79 lbs
5803 g / 56.9 N
 34.82 kg / 76.76 lbs
~0 Gs
3 mm 37.38 kg / 82.40 lbs
4 393 Gs
5.61 kg / 12.36 lbs
5606 g / 55.0 N
 33.64 kg / 74.16 lbs
~0 Gs
5 mm 34.59 kg / 76.25 lbs
4 226 Gs
5.19 kg / 11.44 lbs
5188 g / 50.9 N
 31.13 kg / 68.63 lbs
~0 Gs
10 mm 27.24 kg / 60.06 lbs
3 750 Gs
4.09 kg / 9.01 lbs
4086 g / 40.1 N
 24.52 kg / 54.05 lbs
~0 Gs
20 mm 14.64 kg / 32.28 lbs
2 750 Gs
2.20 kg / 4.84 lbs
2197 g / 21.5 N
 13.18 kg / 29.06 lbs
~0 Gs
50 mm 1.65 kg / 3.63 lbs
922 Gs
0.25 kg / 0.54 lbs
247 g / 2.4 N
 1.48 kg / 3.26 lbs
~0 Gs
60 mm 0.83 kg / 1.84 lbs
656 Gs
0.12 kg / 0.28 lbs
125 g / 1.2 N
 0.75 kg / 1.65 lbs
~0 Gs
70 mm 0.44 kg / 0.97 lbs
477 Gs
0.07 kg / 0.15 lbs
66 g / 0.6 N
 0.40 kg / 0.87 lbs
~0 Gs
80 mm 0.24 kg / 0.54 lbs
355 Gs
0.04 kg / 0.08 lbs
37 g / 0.4 N
 0.22 kg / 0.49 lbs
~0 Gs
90 mm 0.14 kg / 0.31 lbs
270 Gs
0.02 kg / 0.05 lbs
21 g / 0.2 N
 0.13 kg / 0.28 lbs
~0 Gs
100 mm 0.09 kg / 0.19 lbs
210 Gs
0.01 kg / 0.03 lbs
13 g / 0.1 N
 0.08 kg / 0.17 lbs
~0 Gs
Two magnetic products attract each other from a wider radius than a neodymium and metal setup. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of action. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the pinch force is extreme. The levitation is slightly lower than the connection force, but still impressive.
*Flux density in repulsion mode reaches ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Note: Calculations refer to shear force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - warnings
MW 40x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 15.5 cm
Hearing aid 10 Gs (1.0 mT) 12.5 cm
Mechanical watch 20 Gs (2.0 mT) 9.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.5 cm
Remote 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
A strong magnetic field is a real danger to IT equipment and pacemakers. These magnets produce a flux that destroys function of digital equipment. Remember: the invisible magnetic field penetrates the body and glass. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MW 40x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.96 km/h
(5.54 m/s)
 1.16 J
30 mm 29.12 km/h
(8.09 m/s)
 2.47 J
50 mm 37.17 km/h
(10.32 m/s)
 4.02 J
100 mm 52.50 km/h
(14.58 m/s)
 8.02 J
Neodymium magnets are very brittle – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can destroy the magnet or painful pinches to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear eye protection when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 40x8 / 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 following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 40x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 33 553 Mx 335.5 µWb
Pc Coefficient 0.29 Low (Flat)
Flux value emitted by the pole surface. Key data when building generators and motors. Pc value determines the working geometry.

Table 11: Physics of underwater searching
MW 40x8 / N38

Environment Effective steel pull Effect
Air (land) 20.43 kg Standard
Water (riverbed) 23.39 kg
(+2.96 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. 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 only a fraction of its nominal pull.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

*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) = 0.29

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: 010069-2026
Measurement Calculator
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The offered product is an extremely powerful rod magnet, made from modern NdFeB material, which, with dimensions of Ø40x8 mm, guarantees maximum efficiency. The MW 40x8 / N38 component is characterized by high dimensional repeatability and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 20.43 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 200.39 N with a weight of only 75.4 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., 40.1 mm) using epoxy glues. To ensure long-term durability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need the strongest magnets in the same volume (Ø40x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
This model is characterized by dimensions Ø40x8 mm, which, at a weight of 75.4 g, makes it an element with high magnetic energy density. The value of 200.39 N means that the magnet is capable of holding a weight many times exceeding its own mass of 75.4 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 8 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Advantages as well as disadvantages of neodymium magnets.

Advantages

Besides their exceptional field intensity, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They show high resistance to demagnetization induced by external field influence,
  • A magnet with a shiny silver surface is more attractive,
  • Magnets possess huge magnetic induction on the working surface,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Considering the potential of accurate molding and adaptation to specialized needs, NdFeB magnets can be produced in a wide range of shapes and sizes, which increases their versatility,
  • Versatile presence in advanced technology sectors – they are used in computer drives, electromotive mechanisms, diagnostic systems, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in compact constructions

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in creating threads and complex forms in magnets, we recommend using cover - magnetic holder.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Highest magnetic holding force – what affects it?

The specified lifting capacity represents the maximum value, measured under ideal test conditions, meaning:
  • on a block made of structural steel, perfectly concentrating the magnetic flux
  • whose transverse dimension is min. 10 mm
  • characterized by even structure
  • with direct contact (no impurities)
  • under vertical force vector (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Bear in mind that the magnet holding will differ influenced by elements below, in order of importance:
  • Gap (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Base massiveness – too thin plate causes magnetic saturation, causing part of the flux to be escaped to the other side.
  • Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Surface structure – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance between the magnet and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Product not for children

Strictly keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are very dangerous.

Dust explosion hazard

Powder generated during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Life threat

Health Alert: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Bone fractures

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

Eye protection

NdFeB magnets are sintered ceramics, which means they are very brittle. Collision of two magnets leads to them cracking into small pieces.

Threat to navigation

A strong magnetic field negatively affects the operation of compasses in phones and GPS navigation. Keep magnets near a device to prevent damaging the sensors.

Allergic reactions

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop handling magnets and wear gloves.

Data carriers

Powerful magnetic fields can erase data on credit cards, HDDs, and storage devices. Keep a distance of min. 10 cm.

Maximum temperature

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Do not underestimate power

Use magnets consciously. Their immense force can surprise even experienced users. Plan your moves and do not underestimate their force.

Attention! Need more info? Read our article: Are neodymium magnets dangerous?