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MPL 42x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020163

GTIN/EAN: 5906301811695

5.00

length

42 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

31.5 g

Magnetization Direction

↑ axial

Load capacity

11.06 kg / 108.46 N

Magnetic Induction

203.37 mT / 2034 Gs

Coating

[NiCuNi] Nickel

see technical specifications »

15.62 ZŁ with VAT / pcs + price for transport

12.70 ZŁ net + 23% VAT / pcs

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Technical - MPL 42x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 42x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020163
GTIN/EAN 5906301811695
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 42 mm [±0,1 mm]
Width 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 31.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.06 kg / 108.46 N
Magnetic Induction ~ ? 203.37 mT / 2034 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 42x20x5 / 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

Physical simulation of the assembly - data

Presented data represent the outcome of a mathematical simulation. Results are based on algorithms for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these data as a supplementary guide for designers.

Table 1: Static force (force vs gap) - power drop
MPL 42x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2033 Gs
203.3 mT
 11.06 kg / 24.38 LBS
11060.0 g / 108.5 N
 critical level
1 mm 1938 Gs
193.8 mT
 10.05 kg / 22.15 LBS
10049.3 g / 98.6 N
 critical level
2 mm 1823 Gs
182.3 mT
 8.89 kg / 19.60 LBS
8888.2 g / 87.2 N
 medium risk
3 mm 1696 Gs
169.6 mT
 7.69 kg / 16.96 LBS
7691.7 g / 75.5 N
 medium risk
5 mm 1433 Gs
143.3 mT
 5.49 kg / 12.10 LBS
5490.3 g / 53.9 N
 medium risk
10 mm 885 Gs
88.5 mT
 2.09 kg / 4.62 LBS
2093.5 g / 20.5 N
 medium risk
15 mm 547 Gs
54.7 mT
 0.80 kg / 1.76 LBS
799.6 g / 7.8 N
 weak grip
20 mm 350 Gs
35.0 mT
 0.33 kg / 0.72 LBS
327.0 g / 3.2 N
 weak grip
30 mm 160 Gs
16.0 mT
 0.07 kg / 0.15 LBS
68.5 g / 0.7 N
 weak grip
50 mm 48 Gs
4.8 mT
 0.01 kg / 0.01 LBS
6.2 g / 0.1 N
 weak grip
Pulling power decreases significantly with every subsequent millimeter of spacing. Note that even a very thin break (e.g., contamination, varnish, dust) noticeably diminishes the holding power. Neodymiums work strongest during direct contact; distance kills the force. Notice how flashily the parameters fall, when the magnet does not adhere flatly to the metal substrate. When planning the arrangement, discard unnecessary gaps.

Table 2: Slippage force (vertical surface)
MPL 42x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.21 kg / 4.88 LBS
2212.0 g / 21.7 N
1 mm Stal (~0.2) 2.01 kg / 4.43 LBS
2010.0 g / 19.7 N
2 mm Stal (~0.2) 1.78 kg / 3.92 LBS
1778.0 g / 17.4 N
3 mm Stal (~0.2) 1.54 kg / 3.39 LBS
1538.0 g / 15.1 N
5 mm Stal (~0.2) 1.10 kg / 2.42 LBS
1098.0 g / 10.8 N
10 mm Stal (~0.2) 0.42 kg / 0.92 LBS
418.0 g / 4.1 N
15 mm Stal (~0.2) 0.16 kg / 0.35 LBS
160.0 g / 1.6 N
20 mm Stal (~0.2) 0.07 kg / 0.15 LBS
66.0 g / 0.6 N
30 mm Stal (~0.2) 0.01 kg / 0.03 LBS
14.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
The following data presents the theoretical weight limit sufficient to cause the sliding of the magnet down along a upright steel plate (considering standard friction). The holding force depends on the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 42x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.32 kg / 7.31 LBS
3318.0 g / 32.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.21 kg / 4.88 LBS
2212.0 g / 21.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.11 kg / 2.44 LBS
1106.0 g / 10.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.53 kg / 12.19 LBS
5530.0 g / 54.2 N
When placing a magnet on a vertical surface (e.g., a fridge), it you can count on only approx. 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient influence the fact that magnets move down faster than they pop off the substrate. Want to create a hanger? Note that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will give way down under a much lighter cargo. Utilizing a rubberized layer can significantly raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 42x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.55 kg / 1.22 LBS
553.0 g / 5.4 N
1 mm
13%
 1.38 kg / 3.05 LBS
1382.5 g / 13.6 N
2 mm
25%
 2.77 kg / 6.10 LBS
2765.0 g / 27.1 N
3 mm
38%
 4.15 kg / 9.14 LBS
4147.5 g / 40.7 N
5 mm
63%
 6.91 kg / 15.24 LBS
6912.5 g / 67.8 N
10 mm
100%
 11.06 kg / 24.38 LBS
11060.0 g / 108.5 N
11 mm
100%
 11.06 kg / 24.38 LBS
11060.0 g / 108.5 N
12 mm
100%
 11.06 kg / 24.38 LBS
11060.0 g / 108.5 N
A thin metal plate is incapable of take in the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a thin surface, the field will pass right through and the pull force will drop sharply. To squeeze the maximum of this magnet's power, you require a sufficiently solid element of steel. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the magnet shows lower pull force. We advise picking the steel thickness based on the following data.

Table 5: Thermal resistance (material behavior) - power drop
MPL 42x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.06 kg / 24.38 LBS
11060.0 g / 108.5 N
 OK
40 °C -2.2% 10.82 kg / 23.85 LBS
10816.7 g / 106.1 N
 OK
60 °C -4.4% 10.57 kg / 23.31 LBS
10573.4 g / 103.7 N
80 °C -6.6% 10.33 kg / 22.77 LBS
10330.0 g / 101.3 N
100 °C -28.8% 7.87 kg / 17.36 LBS
7874.7 g / 77.3 N
Classic neodymiums lose power past the thermal threshold. Protect against heat – heat can permanently destroy this magnet. As the temperature rises, the magnet's power briefly drops. Do not use this product close to ovens higher than its operating temperature limit. Ignoring the limit will lead to destruction of magnetic properties.
*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) may lose charge permanently under lower heat stress than long magnets. Red status in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 42x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 21.41 kg / 47.21 LBS
3 465 Gs
3.21 kg / 7.08 LBS
3212 g / 31.5 N
 N/A
1 mm 20.49 kg / 45.17 LBS
3 978 Gs
3.07 kg / 6.78 LBS
3074 g / 30.2 N
 18.44 kg / 40.66 LBS
~0 Gs
2 mm 19.46 kg / 42.89 LBS
3 877 Gs
2.92 kg / 6.43 LBS
2918 g / 28.6 N
 17.51 kg / 38.60 LBS
~0 Gs
3 mm 18.35 kg / 40.46 LBS
3 765 Gs
2.75 kg / 6.07 LBS
2753 g / 27.0 N
 16.52 kg / 36.41 LBS
~0 Gs
5 mm 16.05 kg / 35.38 LBS
3 521 Gs
2.41 kg / 5.31 LBS
2407 g / 23.6 N
 14.44 kg / 31.84 LBS
~0 Gs
10 mm 10.63 kg / 23.43 LBS
2 865 Gs
1.59 kg / 3.52 LBS
1594 g / 15.6 N
 9.57 kg / 21.09 LBS
~0 Gs
20 mm 4.05 kg / 8.94 LBS
1 769 Gs
0.61 kg / 1.34 LBS
608 g / 6.0 N
 3.65 kg / 8.04 LBS
~0 Gs
50 mm 0.28 kg / 0.62 LBS
465 Gs
0.04 kg / 0.09 LBS
42 g / 0.4 N
 0.25 kg / 0.55 LBS
~0 Gs
60 mm 0.13 kg / 0.29 LBS
320 Gs
0.02 kg / 0.04 LBS
20 g / 0.2 N
 0.12 kg / 0.26 LBS
~0 Gs
70 mm 0.07 kg / 0.15 LBS
228 Gs
0.01 kg / 0.02 LBS
10 g / 0.1 N
 0.06 kg / 0.13 LBS
~0 Gs
80 mm 0.04 kg / 0.08 LBS
167 Gs
0.01 kg / 0.01 LBS
5 g / 0.1 N
 0.03 kg / 0.07 LBS
~0 Gs
90 mm 0.02 kg / 0.04 LBS
125 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.04 LBS
~0 Gs
100 mm 0.01 kg / 0.03 LBS
96 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.02 LBS
~0 Gs
Two magnets attract each other from a much further distance than a magnet and steel combination. The setup of magnet-to-magnet produces a massive flux and a further horizon of performance. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the collision energy is huge. The repulsion force is marginally weaker than the attraction, but still impressive.
*Flux density for N-N configuration drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
* Calculations apply to shear force of two matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - warnings
MPL 42x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.5 cm
Hearing aid 10 Gs (1.0 mT) 9.0 cm
Timepiece 20 Gs (2.0 mT) 7.0 cm
Mobile device 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 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 electronic devices as well as pacemakers. These magnets produce a flux that destroys function of digital equipment. Notice: the invisible magnetic field acts through matter and glass. Special caution must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MPL 42x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.01 km/h
(5.84 m/s)
 0.54 J
30 mm 32.86 km/h
(9.13 m/s)
 1.31 J
50 mm 42.27 km/h
(11.74 m/s)
 2.17 J
100 mm 59.76 km/h
(16.60 m/s)
 4.34 J
NdFeB products are prone to chipping – a collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed means shattering of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Corrosion resistance
MPL 42x20x5 / 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. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MPL 42x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 18 614 Mx 186.1 µWb
Pc Coefficient 0.23 Low (Flat)
Flux value passing through the magnet pole. Essential parameter in coil applications as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 42x20x5 / N38

Environment Effective steel pull Effect
Air (land) 11.06 kg Standard
Water (riverbed) 12.66 kg
(+1.60 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. 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 retains merely a fraction of its perpendicular strength.

2. Steel saturation

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

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.23

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.

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%
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: 020163-2026
Magnet Unit Converter
Pulling force
Magnetic Field
Input a value into any field, and all other values change on the fly.

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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 42x20x5 mm and a weight of 31.5 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 11.06 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 42x20x5 / 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 42x20x5 / 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. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 42x20x5 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 42x20x5 / N38 model is magnetized through the thickness (dimension 5 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (42x20 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 42x20x5 mm, which, at a weight of 31.5 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 42x20x5 mm and a self-weight of 31.5 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of rare earth magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even after around 10 years – the reduction in power is only ~1% (according to tests),
  • They possess excellent resistance to magnetic field loss when exposed to external magnetic sources,
  • Thanks to the shimmering finish, the surface of Ni-Cu-Ni, gold, or silver-plated gives an aesthetic appearance,
  • Magnets possess maximum magnetic induction on the outer side,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to modularity in shaping and the ability to customize to individual projects,
  • Wide application in future technologies – they find application in computer drives, brushless drives, precision medical tools, also technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • NdFeB magnets lose force 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 extremely 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 immune to moisture, in case of application outdoors
  • We recommend casing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what affects it?

Magnet power is the result of a measurement for ideal contact conditions, assuming:
  • using a plate made of low-carbon steel, serving as a ideal flux conductor
  • with a thickness minimum 10 mm
  • with a plane cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Practical lifting capacity: influencing factors

It is worth knowing that the magnet holding will differ influenced by elements below, in order of importance:
  • Distance – existence of foreign body (rust, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Material type – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Plate texture – ground elements ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity was assessed with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a small distance between the magnet and the plate reduces the lifting capacity.

Precautions when working with neodymium magnets
Threat to navigation

Be aware: rare earth magnets produce a field that disrupts sensitive sensors. Keep a separation from your mobile, tablet, and navigation systems.

Magnetic media

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Danger to the youngest

Absolutely store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are tragic.

Eye protection

Protect your eyes. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Allergic reactions

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

Serious injuries

Pinching hazard: The attraction force is so great that it can cause hematomas, pinching, and broken bones. Use thick gloves.

Maximum temperature

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Conscious usage

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

Fire warning

Dust produced during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Health Danger

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

Important! Looking for details? Check our post: Are neodymium magnets dangerous?