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MPL 50x30x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020497

GTIN/EAN: 5906301814955

length

50 mm [±0,1 mm]

Width

30 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

45 g

Magnetization Direction

↑ axial

Load capacity

7.57 kg / 74.26 N

Magnetic Induction

120.04 mT / 1200 Gs

Coating

[NiCuNi] Nickel

view specifications »

25.83 ZŁ with VAT / pcs + price for transport

21.00 ZŁ net + 23% VAT / pcs

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Force as well as shape of a neodymium magnet can be verified on our online calculation tool.

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Physical properties - MPL 50x30x4 / N38 - lamellar magnet

Specification / characteristics - MPL 50x30x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020497
GTIN/EAN 5906301814955
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 50 mm [±0,1 mm]
Width 30 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 45 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.57 kg / 74.26 N
Magnetic Induction ~ ? 120.04 mT / 1200 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x30x4 / 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

Technical simulation of the assembly - technical parameters

The following values are the result of a engineering analysis. Values are based on models for the material Nd2Fe14B. Real-world parameters may deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - power drop
MPL 50x30x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1200 Gs
120.0 mT
 7.57 kg / 16.69 pounds
7570.0 g / 74.3 N
 strong
1 mm 1176 Gs
117.6 mT
 7.27 kg / 16.03 pounds
7270.9 g / 71.3 N
 strong
2 mm 1144 Gs
114.4 mT
 6.88 kg / 15.16 pounds
6877.1 g / 67.5 N
 strong
3 mm 1105 Gs
110.5 mT
 6.41 kg / 14.14 pounds
6414.7 g / 62.9 N
 strong
5 mm 1012 Gs
101.2 mT
 5.38 kg / 11.86 pounds
5381.2 g / 52.8 N
 strong
10 mm 754 Gs
75.4 mT
 2.99 kg / 6.59 pounds
2990.1 g / 29.3 N
 strong
15 mm 535 Gs
53.5 mT
 1.50 kg / 3.31 pounds
1503.5 g / 14.7 N
 weak grip
20 mm 376 Gs
37.6 mT
 0.74 kg / 1.64 pounds
743.3 g / 7.3 N
 weak grip
30 mm 193 Gs
19.3 mT
 0.20 kg / 0.43 pounds
195.8 g / 1.9 N
 weak grip
50 mm 64 Gs
6.4 mT
 0.02 kg / 0.05 pounds
21.4 g / 0.2 N
 weak grip
Pulling power weakens sharply with every subsequent millimeter of gap. Keep in mind that even the smallest gap (e.g., contamination, varnish, veneer) significantly diminishes the holding power. Magnets operate strongest at the point of direct contact; gap nullifies the power. Analyze how quickly the load capacity plummet, when the magnet does not touch flatly to the metal substrate. When calculating the mounting, discard unnecessary gaps.

Table 2: Shear hold (wall)
MPL 50x30x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.51 kg / 3.34 pounds
1514.0 g / 14.9 N
1 mm Stal (~0.2) 1.45 kg / 3.21 pounds
1454.0 g / 14.3 N
2 mm Stal (~0.2) 1.38 kg / 3.03 pounds
1376.0 g / 13.5 N
3 mm Stal (~0.2) 1.28 kg / 2.83 pounds
1282.0 g / 12.6 N
5 mm Stal (~0.2) 1.08 kg / 2.37 pounds
1076.0 g / 10.6 N
10 mm Stal (~0.2) 0.60 kg / 1.32 pounds
598.0 g / 5.9 N
15 mm Stal (~0.2) 0.30 kg / 0.66 pounds
300.0 g / 2.9 N
20 mm Stal (~0.2) 0.15 kg / 0.33 pounds
148.0 g / 1.5 N
30 mm Stal (~0.2) 0.04 kg / 0.09 pounds
40.0 g / 0.4 N
50 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
The following data calculates the theoretical holding capacity required to cause the downward movement of the magnet down along a upright metal surface (assuming standard friction coefficient). The holding force is relative to the air gap between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 50x30x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.27 kg / 5.01 pounds
2271.0 g / 22.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.51 kg / 3.34 pounds
1514.0 g / 14.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.76 kg / 1.67 pounds
757.0 g / 7.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.79 kg / 8.34 pounds
3785.0 g / 37.1 N
When placing a magnet on a upright plane (e.g., a car body), it you can count on barely about 1/5 of its maximum pull force. Gravitational force and a weak degree of grip mean that magnets slip easier than they pull off. Planning a vertical fastening? Consider that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the holder will slide down under a significantly smaller load. Application of an anti-slip coating can effectively improve the result.

Table 4: Material efficiency (saturation) - power losses
MPL 50x30x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.76 kg / 1.67 pounds
757.0 g / 7.4 N
1 mm
25%
 1.89 kg / 4.17 pounds
1892.5 g / 18.6 N
2 mm
50%
 3.79 kg / 8.34 pounds
3785.0 g / 37.1 N
3 mm
75%
 5.68 kg / 12.52 pounds
5677.5 g / 55.7 N
5 mm
100%
 7.57 kg / 16.69 pounds
7570.0 g / 74.3 N
10 mm
100%
 7.57 kg / 16.69 pounds
7570.0 g / 74.3 N
11 mm
100%
 7.57 kg / 16.69 pounds
7570.0 g / 74.3 N
12 mm
100%
 7.57 kg / 16.69 pounds
7570.0 g / 74.3 N
A too thin steel is incapable of conduct the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a too thin substrate, the flux will pass right through and the attraction force will be weaker. To squeeze 100% of this magnet's potential, you need a suitably thick element of steel. The material oversaturation means that on thin elements (e.g., appliance housings), the product holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal resistance (stability) - power drop
MPL 50x30x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.57 kg / 16.69 pounds
7570.0 g / 74.3 N
 OK
40 °C -2.2% 7.40 kg / 16.32 pounds
7403.5 g / 72.6 N
 OK
60 °C -4.4% 7.24 kg / 15.95 pounds
7236.9 g / 71.0 N
80 °C -6.6% 7.07 kg / 15.59 pounds
7070.4 g / 69.4 N
100 °C -28.8% 5.39 kg / 11.88 pounds
5389.8 g / 52.9 N
Classic neodymiums change their properties parameters after exceeding the maximum temperature. Watch out for overheating – heat can permanently destroy this magnet. With every degree above norm, the neodymium's force momentarily lowers. Avoid using this product close to heaters higher than its operating temperature limit. Too high temperature will lead to permanent loss of magnetism.
*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures compared to rod magnets. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - field range
MPL 50x30x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.32 kg / 29.37 pounds
2 260 Gs
2.00 kg / 4.41 pounds
1999 g / 19.6 N
 N/A
1 mm 13.09 kg / 28.85 pounds
2 379 Gs
1.96 kg / 4.33 pounds
1963 g / 19.3 N
 11.78 kg / 25.96 pounds
~0 Gs
2 mm 12.80 kg / 28.21 pounds
2 353 Gs
1.92 kg / 4.23 pounds
1920 g / 18.8 N
 11.52 kg / 25.39 pounds
~0 Gs
3 mm 12.47 kg / 27.49 pounds
2 322 Gs
1.87 kg / 4.12 pounds
1870 g / 18.3 N
 11.22 kg / 24.74 pounds
~0 Gs
5 mm 11.71 kg / 25.82 pounds
2 251 Gs
1.76 kg / 3.87 pounds
1756 g / 17.2 N
 10.54 kg / 23.23 pounds
~0 Gs
10 mm 9.47 kg / 20.88 pounds
2 024 Gs
1.42 kg / 3.13 pounds
1421 g / 13.9 N
 8.52 kg / 18.79 pounds
~0 Gs
20 mm 5.26 kg / 11.60 pounds
1 509 Gs
0.79 kg / 1.74 pounds
789 g / 7.7 N
 4.74 kg / 10.44 pounds
~0 Gs
50 mm 0.66 kg / 1.45 pounds
534 Gs
0.10 kg / 0.22 pounds
99 g / 1.0 N
 0.59 kg / 1.31 pounds
~0 Gs
60 mm 0.34 kg / 0.76 pounds
386 Gs
0.05 kg / 0.11 pounds
52 g / 0.5 N
 0.31 kg / 0.68 pounds
~0 Gs
70 mm 0.19 kg / 0.41 pounds
285 Gs
0.03 kg / 0.06 pounds
28 g / 0.3 N
 0.17 kg / 0.37 pounds
~0 Gs
80 mm 0.11 kg / 0.23 pounds
214 Gs
0.02 kg / 0.03 pounds
16 g / 0.2 N
 0.10 kg / 0.21 pounds
~0 Gs
90 mm 0.06 kg / 0.14 pounds
164 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
 0.06 kg / 0.12 pounds
~0 Gs
100 mm 0.04 kg / 0.08 pounds
128 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.03 kg / 0.07 pounds
~0 Gs
Two magnets attract each other from a much further distance than a magnet and sheet combination. The connection of magnet-to-magnet produces a massive flux and a further horizon of operation. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Remember 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 between like poles reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Important: Calculations refer to sliding force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - precautionary measures
MPL 50x30x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Car key 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation is a serious hazard to electronic devices and pacemakers. These NdFeB products generate a flux that destroys function of sensitive medical devices. Remember: the unseen radiation acts through matter and housings. Special caution must be taken by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MPL 50x30x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.99 km/h
(4.44 m/s)
 0.44 J
30 mm 23.02 km/h
(6.39 m/s)
 0.92 J
50 mm 29.30 km/h
(8.14 m/s)
 1.49 J
100 mm 41.37 km/h
(11.49 m/s)
 2.97 J
Magnetic elements are very brittle – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Impact energy can trigger coating fragments or injury to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the metal. A collision at high speed means shattering of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Coating parameters (durability)
MPL 50x30x4 / 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)
MPL 50x30x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 399 Mx 224.0 µWb
Pc Coefficient 0.14 Low (Flat)
Flux value passing through the pole surface. Key data when building generators as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
MPL 50x30x4 / N38

Environment Effective steel pull Effect
Air (land) 7.57 kg Standard
Water (riverbed) 8.67 kg
(+1.10 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.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Caution: On a vertical wall, the magnet retains merely a fraction of its nominal pull.

2. Steel thickness impact

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

3. Thermal stability

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.14

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 and environmental data
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: 020497-2026
Measurement Calculator
Force (pull)
Magnetic Induction
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Component MPL 50x30x4 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 74.26 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 50x30x4 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 50x30x4 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 7.57 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 50x30x4 / N38 model is magnetized through the thickness (dimension 4 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 (50x30 mm), which is ideal for flat mounting. 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: 50 mm (length), 30 mm (width), and 4 mm (thickness). It is a magnetic block with dimensions 50x30x4 mm and a self-weight of 45 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.

Strengths

Besides their immense strength, neodymium magnets offer the following advantages:
  • They do not lose power, even during around ten years – the drop in power is only ~1% (according to tests),
  • They feature excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
  • Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold, or silver gives an aesthetic appearance,
  • They show high magnetic induction at the operating surface, making them more effective,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of detailed creating as well as adjusting to concrete conditions,
  • Wide application in high-tech industry – they are commonly used in mass storage devices, electric drive systems, medical devices, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems

Weaknesses

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating nuts in the magnet and complicated forms - preferred is cover - magnetic holder.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small components of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum holding power of the magnet – what affects it?

The declared magnet strength concerns the limit force, obtained under ideal test conditions, specifically:
  • on a block made of structural steel, perfectly concentrating the magnetic field
  • with a cross-section of at least 10 mm
  • characterized by lack of roughness
  • with direct contact (without impurities)
  • during pulling in a direction perpendicular to the plane
  • in temp. approx. 20°C

Lifting capacity in real conditions – factors

Effective lifting capacity is influenced by specific conditions, mainly (from most important):
  • Air gap (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Precautions when working with neodymium magnets
Skin irritation risks

It is widely known that nickel (the usual finish) is a common allergen. For allergy sufferers, avoid direct skin contact or select encased magnets.

No play value

These products are not suitable for play. Eating a few magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.

Electronic devices

Do not bring magnets close to a purse, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Heat sensitivity

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

Pacemakers

People with a pacemaker have to maintain an absolute distance from magnets. The magnetism can interfere with the operation of the life-saving device.

Immense force

Be careful. Neodymium magnets attract from a long distance and connect with massive power, often quicker than you can react.

Dust explosion hazard

Machining of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Pinching danger

Danger of trauma: The pulling power is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Compass and GPS

A powerful magnetic field disrupts the operation of compasses in smartphones and GPS navigation. Maintain magnets close to a device to prevent breaking the sensors.

Protective goggles

Protect your eyes. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Caution! Want to know more? Read our article: Why are neodymium magnets dangerous?