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MW 14x2 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010024

GTIN/EAN: 5906301810230

Load capacity 1.48 kg / 14.51 N Magnetic Induction 170.27 mT / 1703 Gs
Diameter Ø
14 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
2.31 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
check parameters »

0.898 zł with VAT / pcs + price for transport

0.730 zł net + 23% VAT / pcs

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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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Detailed specification - MW 14x2 / N38 - cylindrical magnet

Specification / characteristics - MW 14x2 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010024
GTIN/EAN 5906301810230
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 14 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 2.31 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.48 kg / 14.51 N
Magnetic Induction ~ ? 170.27 mT / 1703 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 14x2 / 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

Engineering analysis of the magnet - report

Presented information represent the outcome of a physical calculation. Results are based on models for the material Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
MW 14x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1702 Gs
170.2 mT
 1.48 kg / 3.26 lbs
1480.0 g / 14.5 N
 low risk
1 mm 1565 Gs
156.5 mT
 1.25 kg / 2.76 lbs
1251.7 g / 12.3 N
 low risk
2 mm 1373 Gs
137.3 mT
 0.96 kg / 2.12 lbs
962.5 g / 9.4 N
 low risk
3 mm 1161 Gs
116.1 mT
 0.69 kg / 1.52 lbs
688.9 g / 6.8 N
 low risk
5 mm 780 Gs
78.0 mT
 0.31 kg / 0.69 lbs
311.0 g / 3.1 N
 low risk
10 mm 276 Gs
27.6 mT
 0.04 kg / 0.09 lbs
39.0 g / 0.4 N
 low risk
15 mm 115 Gs
11.5 mT
 0.01 kg / 0.01 lbs
6.7 g / 0.1 N
 low risk
20 mm 56 Gs
5.6 mT
 0.00 kg / 0.00 lbs
1.6 g / 0.0 N
 low risk
30 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 low risk
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
Pulling power weakens significantly with every subsequent millimeter of gap. Note that even a microscopic distance (e.g., contamination, paint, dust) strongly weakens the grip. Neodymiums hold strongest at the point of direct contact; air break weakens the power. Notice how quickly the parameters plummet, when the product does not adhere directly to the steel surface. When planning the assembly, discard additional spacers.

Table 2: Sliding load (wall)
MW 14x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.30 kg / 0.65 lbs
296.0 g / 2.9 N
1 mm Stal (~0.2) 0.25 kg / 0.55 lbs
250.0 g / 2.5 N
2 mm Stal (~0.2) 0.19 kg / 0.42 lbs
192.0 g / 1.9 N
3 mm Stal (~0.2) 0.14 kg / 0.30 lbs
138.0 g / 1.4 N
5 mm Stal (~0.2) 0.06 kg / 0.14 lbs
62.0 g / 0.6 N
10 mm Stal (~0.2) 0.01 kg / 0.02 lbs
8.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below presents the estimated shear load sufficient to initiate the shifting of the magnet downwards on a upright metal surface (considering typical friction coefficient). The holding force is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MW 14x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.44 kg / 0.98 lbs
444.0 g / 4.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.30 kg / 0.65 lbs
296.0 g / 2.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.15 kg / 0.33 lbs
148.0 g / 1.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.74 kg / 1.63 lbs
740.0 g / 7.3 N
When mounting a magnet on a vertical surface (e.g., a board), it will maintain just approx. 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient influence the fact that products slip easier than they pop off the substrate. Designing a vertical fastening? Note that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the element will slip down under a significantly smaller weight. Using a rubber pad can effectively increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 14x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.15 kg / 0.33 lbs
148.0 g / 1.5 N
1 mm
25%
 0.37 kg / 0.82 lbs
370.0 g / 3.6 N
2 mm
50%
 0.74 kg / 1.63 lbs
740.0 g / 7.3 N
3 mm
75%
 1.11 kg / 2.45 lbs
1110.0 g / 10.9 N
5 mm
100%
 1.48 kg / 3.26 lbs
1480.0 g / 14.5 N
10 mm
100%
 1.48 kg / 3.26 lbs
1480.0 g / 14.5 N
11 mm
100%
 1.48 kg / 3.26 lbs
1480.0 g / 14.5 N
12 mm
100%
 1.48 kg / 3.26 lbs
1480.0 g / 14.5 N
A thin metal plate is not enough to take in the entire magnetic field, which weakens actual performance of the magnet. Should you install a neodymium to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's power, you need a suitably thick piece of steel. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the holder shows lower pull force. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal resistance (material behavior) - power drop
MW 14x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.48 kg / 3.26 lbs
1480.0 g / 14.5 N
 OK
40 °C -2.2% 1.45 kg / 3.19 lbs
1447.4 g / 14.2 N
 OK
60 °C -4.4% 1.41 kg / 3.12 lbs
1414.9 g / 13.9 N
80 °C -6.6% 1.38 kg / 3.05 lbs
1382.3 g / 13.6 N
100 °C -28.8% 1.05 kg / 2.32 lbs
1053.8 g / 10.3 N
Ordinary NdFeB products change their properties power past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly damage this magnet. As the temperature rises, the neodymium's power temporarily lowers. Avoid using this product in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) may lose charge permanently sooner than long magnets. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 14x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.75 kg / 6.06 lbs
3 073 Gs
0.41 kg / 0.91 lbs
413 g / 4.0 N
 N/A
1 mm 2.56 kg / 5.65 lbs
3 287 Gs
0.38 kg / 0.85 lbs
385 g / 3.8 N
 2.31 kg / 5.09 lbs
~0 Gs
2 mm 2.33 kg / 5.13 lbs
3 131 Gs
0.35 kg / 0.77 lbs
349 g / 3.4 N
 2.09 kg / 4.61 lbs
~0 Gs
3 mm 2.06 kg / 4.54 lbs
2 947 Gs
0.31 kg / 0.68 lbs
309 g / 3.0 N
 1.85 kg / 4.09 lbs
~0 Gs
5 mm 1.52 kg / 3.36 lbs
2 535 Gs
0.23 kg / 0.50 lbs
229 g / 2.2 N
 1.37 kg / 3.02 lbs
~0 Gs
10 mm 0.58 kg / 1.27 lbs
1 561 Gs
0.09 kg / 0.19 lbs
87 g / 0.9 N
 0.52 kg / 1.15 lbs
~0 Gs
20 mm 0.07 kg / 0.16 lbs
552 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
 0.07 kg / 0.14 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
62 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
38 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
25 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
17 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
12 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
9 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a wider radius than a magnet and sheet setup. Such a system of magnet-to-magnet creates a more powerful interaction and a further horizon of action. Want to build a solid fastener? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the impact force is extreme. The levitation is a bit weaker than the attraction, but still large.
*The magnetic induction in repulsion mode reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Attention: Figures apply to sliding force of dual matching neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - precautionary measures
MW 14x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Mobile device 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field is a large risk to IT equipment as well as pacemakers. These magnets generate a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field passes through tissues and housings. Exceptional care must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MW 14x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.25 km/h
(6.46 m/s)
 0.05 J
30 mm 23.52 km/h
(6.53 m/s)
 0.05 J
50 mm 23.52 km/h
(6.53 m/s)
 0.05 J
100 mm 23.52 km/h
(6.53 m/s)
 0.05 J
NdFeB products are very brittle – a collision with steel risks their cracking. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Kinetic force can destroy the magnet or injury to skin. Always hold the magnet during installation so it doesn't hit violently against the metal. A collision at high speed means shattering of the neodymium. Wear safety glasses when working with powerful specimens.

Table 9: Surface protection spec
MW 14x2 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MW 14x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 247 Mx 32.5 µWb
Pc Coefficient 0.22 Low (Flat)
Flux value emitted by the pole surface. Essential parameter in coil applications as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
MW 14x2 / N38

Environment Effective steel pull Effect
Air (land) 1.48 kg Standard
Water (riverbed) 1.69 kg
(+0.21 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds merely a fraction of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. computer case) drastically reduces 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) = 0.22

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.

Engineering data and GPSR

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%

Ecology and recycling (GPSR)

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: 010024-2026
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This product is a very strong cylinder magnet, composed of durable NdFeB material, which, with dimensions of Ø14x2 mm, guarantees the highest energy density. The MW 14x2 / N38 component is characterized by a tolerance of ±0.1mm and professional build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 1.48 kg), this product is available off-the-shelf from our warehouse in Poland, 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 created for building generators, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 14.51 N with a weight of only 2.31 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 14.1 mm) using two-component epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are suitable for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø14x2), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø14x2 mm, which, at a weight of 2.31 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 1.48 kg (force ~14.51 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 2 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths and weaknesses of neodymium magnets.

Strengths

Apart from their consistent power, neodymium magnets have these key benefits:
  • They retain magnetic properties for around ten years – the drop is just ~1% (in theory),
  • They are extremely resistant to demagnetization induced by external magnetic fields,
  • The use of an refined finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnets possess very high magnetic induction on the surface,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
  • Considering the potential of accurate forming and adaptation to unique needs, NdFeB magnets can be manufactured in a wide range of geometric configurations, which expands the range of possible applications,
  • Versatile presence in modern industrial fields – they find application in hard drives, motor assemblies, medical devices, as well as other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also increases their 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
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these devices can disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Magnetic strength at its maximum – what contributes to it?

Magnet power was determined for ideal contact conditions, taking into account:
  • on a block made of structural steel, optimally conducting the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • with a surface free of scratches
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction perpendicular to the mounting surface
  • in stable room temperature

Key elements affecting lifting force

Please note that the application force may be lower depending on the following factors, starting with the most relevant:
  • Distance – the presence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content decrease magnetic permeability and holding force.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was determined with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Medical interference

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Magnets are brittle

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

Phone sensors

A powerful magnetic field interferes with the operation of magnetometers in phones and navigation systems. Keep magnets near a device to prevent breaking the sensors.

Pinching danger

Big blocks can break fingers in a fraction of a second. Do not put your hand betwixt two strong magnets.

Power loss in heat

Standard neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Handling guide

Handle with care. Neodymium magnets act from a distance and connect with huge force, often faster than you can react.

This is not a toy

Neodymium magnets are not suitable for play. Swallowing several magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.

Flammability

Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Metal Allergy

Medical facts indicate that nickel (the usual finish) is a potent allergen. If you have an allergy, refrain from touching magnets with bare hands and opt for encased magnets.

Data carriers

Do not bring magnets close to a purse, computer, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Security! Want to know more? Check our post: Are neodymium magnets dangerous?