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MP 24x16x2 / N38 - ring magnet

ring magnet

Catalog no 030495

GTIN/EAN: 5906301812364

5.00
Load capacity 0.94 kg / 9.22 N Magnetic Induction 101.91 mT / 1019 Gs
Diameter
24 mm [±0,1 mm]
internal diameter Ø
16 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
3.77 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

product specifications »

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Frequently asked questions

What is the hole in a ring magnet for?
For mounting on a screw or a shaft. The bore may be cylindrical or countersunk for a screw head. The hole removes magnet volume, so a ring holds less than a disc of the same outside diameter.
What is the polarisation?
Axial as standard — poles on the flat faces of the ring. Diametrical polarisation is made to order.
What sizes are available?
Outside diameter from 5 to 62 mm from stock. To order up to 200 mm outside diameter, 180 mm bore and 40 mm height, with a lead time of 25–35 days.

Guides from the knowledge base

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.

PDF report Calculator
Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Product card - MP 24x16x2 / N38 - ring magnet

Specification / characteristics - MP 24x16x2 / N38 - ring magnet

properties
properties values
Cat. no. 030495
GTIN/EAN 5906301812364
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 24 mm [±0,1 mm]
internal diameter Ø 16 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 3.77 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.94 kg / 9.22 N
Magnetic Induction ~ ? 101.91 mT / 1019 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 24x16x2 / N38 - ring magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 product - technical parameters

The following information constitute the direct effect of a physical analysis. Results are based on models for the material Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs distance) - characteristics
MP 24x16x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5807 Gs
580.7 mT
 0.94 kg / 2.07 LBS
940.0 g / 9.2 N
 low risk
1 mm 5318 Gs
531.8 mT
 0.79 kg / 1.74 LBS
788.4 g / 7.7 N
 low risk
2 mm 4833 Gs
483.3 mT
 0.65 kg / 1.44 LBS
651.1 g / 6.4 N
 low risk
3 mm 4366 Gs
436.6 mT
 0.53 kg / 1.17 LBS
531.5 g / 5.2 N
 low risk
5 mm 3517 Gs
351.7 mT
 0.34 kg / 0.76 LBS
344.9 g / 3.4 N
 low risk
10 mm 1995 Gs
199.5 mT
 0.11 kg / 0.24 LBS
111.0 g / 1.1 N
 low risk
15 mm 1168 Gs
116.8 mT
 0.04 kg / 0.08 LBS
38.0 g / 0.4 N
 low risk
20 mm 727 Gs
72.7 mT
 0.01 kg / 0.03 LBS
14.7 g / 0.1 N
 low risk
30 mm 332 Gs
33.2 mT
 0.00 kg / 0.01 LBS
3.1 g / 0.0 N
 low risk
50 mm 106 Gs
10.6 mT
 0.00 kg / 0.00 LBS
0.3 g / 0.0 N
 low risk
Grip strength weakens drastically with every subsequent millimeter of spacing. Remember that even a very thin break (e.g., contamination, paint, rust) significantly weakens the grip. Neodymiums operate strongest at the point of direct contact; distance kills the force. Notice how flashily the pull force drop, when the product does not adhere tightly to the metal substrate. When calculating the arrangement, discard additional spacers.

Table 2: Sliding load (vertical surface)
MP 24x16x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.19 kg / 0.41 LBS
188.0 g / 1.8 N
1 mm Stal (~0.2) 0.16 kg / 0.35 LBS
158.0 g / 1.5 N
2 mm Stal (~0.2) 0.13 kg / 0.29 LBS
130.0 g / 1.3 N
3 mm Stal (~0.2) 0.11 kg / 0.23 LBS
106.0 g / 1.0 N
5 mm Stal (~0.2) 0.07 kg / 0.15 LBS
68.0 g / 0.7 N
10 mm Stal (~0.2) 0.02 kg / 0.05 LBS
22.0 g / 0.2 N
15 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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 following data calculates the estimated shear load necessary to cause the slippage of the magnet vertically along a vertical steel wall (considering typical friction coefficient). The holding force depends on the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MP 24x16x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.28 kg / 0.62 LBS
282.0 g / 2.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.19 kg / 0.41 LBS
188.0 g / 1.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.09 kg / 0.21 LBS
94.0 g / 0.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.47 kg / 1.04 LBS
470.0 g / 4.6 N
When hanging a holder on a vertical wall (e.g., a car body), it will only hold barely approx. 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip mean that magnets move down easier than they pop off the substrate. Want to create a hanger? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the holder will slip down under a noticeably lighter load. Application of an anti-slip pad can significantly increase the grip.

Table 4: Material efficiency (saturation) - power losses
MP 24x16x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.09 kg / 0.21 LBS
94.0 g / 0.9 N
1 mm
25%
 0.24 kg / 0.52 LBS
235.0 g / 2.3 N
2 mm
50%
 0.47 kg / 1.04 LBS
470.0 g / 4.6 N
3 mm
75%
 0.71 kg / 1.55 LBS
705.0 g / 6.9 N
5 mm
100%
 0.94 kg / 2.07 LBS
940.0 g / 9.2 N
10 mm
100%
 0.94 kg / 2.07 LBS
940.0 g / 9.2 N
11 mm
100%
 0.94 kg / 2.07 LBS
940.0 g / 9.2 N
12 mm
100%
 0.94 kg / 2.07 LBS
940.0 g / 9.2 N
A too thin steel is incapable of absorb the full magnetic flux, which weakens actual performance of the holder. Should you mount a strong magnet to a weak sheet, the field will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's potential, you need a suitably thick piece of metal. The saturation effect causes that on sheet metal structures (e.g., thin profiles), the product shows lower pull force. We advise picking the steel dimension based on the following data.

Table 5: Thermal resistance (material behavior) - power drop
MP 24x16x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.94 kg / 2.07 LBS
940.0 g / 9.2 N
 OK
40 °C -2.2% 0.92 kg / 2.03 LBS
919.3 g / 9.0 N
 OK
60 °C -4.4% 0.90 kg / 1.98 LBS
898.6 g / 8.8 N
 OK
80 °C -6.6% 0.88 kg / 1.94 LBS
878.0 g / 8.6 N
100 °C -28.8% 0.67 kg / 1.48 LBS
669.3 g / 6.6 N
Standard neodymium magnets change their properties parameters above the temperature limit. Watch out for overheating – excessive heat can permanently demagnetize this product. As the temperature rises, the magnet's power temporarily drops. Avoid using this product close to ovens exceeding its safe range. Too high temperature will result in permanent loss of magnetism.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) risk losing magnetic properties sooner compared to rod magnets. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MP 24x16x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 79.38 kg / 175.01 LBS
6 091 Gs
11.91 kg / 26.25 LBS
11908 g / 116.8 N
 N/A
1 mm 72.89 kg / 160.70 LBS
11 129 Gs
10.93 kg / 24.11 LBS
10934 g / 107.3 N
 65.60 kg / 144.63 LBS
~0 Gs
2 mm 66.58 kg / 146.78 LBS
10 636 Gs
9.99 kg / 22.02 LBS
9987 g / 98.0 N
 59.92 kg / 132.10 LBS
~0 Gs
3 mm 60.60 kg / 133.60 LBS
10 147 Gs
9.09 kg / 20.04 LBS
9090 g / 89.2 N
 54.54 kg / 120.24 LBS
~0 Gs
5 mm 49.75 kg / 109.67 LBS
9 194 Gs
7.46 kg / 16.45 LBS
7462 g / 73.2 N
 44.77 kg / 98.70 LBS
~0 Gs
10 mm 29.13 kg / 64.21 LBS
7 035 Gs
4.37 kg / 9.63 LBS
4369 g / 42.9 N
 26.21 kg / 57.79 LBS
~0 Gs
20 mm 9.37 kg / 20.67 LBS
3 991 Gs
1.41 kg / 3.10 LBS
1406 g / 13.8 N
 8.44 kg / 18.60 LBS
~0 Gs
50 mm 0.54 kg / 1.19 LBS
958 Gs
0.08 kg / 0.18 LBS
81 g / 0.8 N
 0.49 kg / 1.07 LBS
~0 Gs
60 mm 0.26 kg / 0.57 LBS
663 Gs
0.04 kg / 0.09 LBS
39 g / 0.4 N
 0.23 kg / 0.51 LBS
~0 Gs
70 mm 0.13 kg / 0.30 LBS
478 Gs
0.02 kg / 0.04 LBS
20 g / 0.2 N
 0.12 kg / 0.27 LBS
~0 Gs
80 mm 0.07 kg / 0.16 LBS
356 Gs
0.01 kg / 0.02 LBS
11 g / 0.1 N
 0.07 kg / 0.15 LBS
~0 Gs
90 mm 0.04 kg / 0.10 LBS
272 Gs
0.01 kg / 0.01 LBS
7 g / 0.1 N
 0.04 kg / 0.09 LBS
~0 Gs
100 mm 0.03 kg / 0.06 LBS
213 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and steel combination. The setup of two magnets produces a massive flux and a further horizon of operation. Designing a strong closure? Apply two magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the pinch force is extreme. The repulsion force is slightly lower than the connection force, but still significant.
*Field value in repulsion mode reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Note: Results apply to friction force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - warnings
MP 24x16x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.5 cm
Hearing aid 10 Gs (1.0 mT) 13.0 cm
Timepiece 20 Gs (2.0 mT) 10.0 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Car key 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
Powerful magnet radiation is a serious hazard to electronics and medical implants. These NdFeB products generate a field that disrupts operation of digital equipment. Be aware: the unseen radiation acts through matter and housings. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MP 24x16x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.57 km/h
(4.60 m/s)
 0.04 J
30 mm 17.61 km/h
(4.89 m/s)
 0.05 J
50 mm 17.66 km/h
(4.91 m/s)
 0.05 J
100 mm 17.67 km/h
(4.91 m/s)
 0.05 J
Magnetic elements are delicate – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely becomes dangerous. Kinetic force can cause material chips or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MP 24x16x2 / 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 (Pc)
MP 24x16x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 23 520 Mx 235.2 µWb
Pc Coefficient 1.04 High (Stable)
Flux value emitted by the pole surface. Essential parameter in coil applications and motors. The Pc coefficient defines the magnet's operating point.

Table 11: Physics of underwater searching
MP 24x16x2 / N38

Environment Effective steel pull Effect
Air (land) 0.94 kg Standard
Water (riverbed) 1.08 kg
(+0.14 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Vertical hold

*Note: On a vertical surface, the magnet holds just ~20% of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) severely reduces the holding force.

3. Temperature resistance

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.04

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: 030495-2026
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It is ideally suited for places where solid attachment of the magnet to the substrate is required without the risk of detachment. Thanks to the hole (often for a screw), this model enables easy screwing to wood, wall, plastic, or metal. It is also often used in advertising for fixing signs and in workshops for organizing tools.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. When tightening the screw, you must maintain caution. We recommend tightening manually with a screwdriver, not an impact driver, because excessive force will cause the ring to crack. The flat screw head should evenly press the magnet. Remember: cracking during assembly results from material properties, not a product defect.
Moisture can penetrate micro-cracks in the coating and cause oxidation of the magnet. In the place of the mounting hole, the coating is thinner and can be damaged when tightening the screw, which will become a corrosion focus. This product is dedicated for inside building use. For outdoor applications, we recommend choosing rubberized holders or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 16 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Always check that the screw head is not larger than the outer diameter of the magnet (24 mm), so it doesn't protrude beyond the outline.
This model is characterized by dimensions Ø24x2 mm and a weight of 3.77 g. The pulling force of this model is an impressive 0.94 kg, which translates to 9.22 N in newtons. The mounting hole diameter is precisely 16 mm.
These magnets are magnetized axially (through the thickness), which means one flat side is the N pole and the other is S. If you want two such magnets screwed with cones facing each other (faces) to attract, you must connect them with opposite poles (N to S). When ordering a larger quantity, magnets are usually packed in stacks, where they are already naturally paired.

Advantages and disadvantages of rare earth magnets.

Strengths

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • They do not lose power, even during around ten years – the reduction in lifting capacity is only ~1% (theoretically),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • In other words, due to the smooth surface of nickel, the element gains a professional look,
  • Magnets possess maximum magnetic induction on the working surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to flexibility in designing and the ability to modify to complex applications,
  • Universal use in future technologies – they serve a role in mass storage devices, drive modules, medical equipment, and modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complicated shapes.
  • Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

The force parameter is a measurement result executed under the following configuration:
  • using a base made of mild steel, functioning as a magnetic yoke
  • whose transverse dimension equals approx. 10 mm
  • characterized by even structure
  • without any clearance between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • at standard ambient temperature

Lifting capacity in practice – influencing factors

Bear in mind that the working load will differ subject to the following factors, starting with the most relevant:
  • Gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Plate thickness – insufficiently thick sheet causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Plate material – low-carbon steel gives the best results. Higher carbon content reduce magnetic properties and lifting capacity.
  • Base smoothness – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

H&S for magnets
Crushing risk

Danger of trauma: The attraction force is so immense that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.

Choking Hazard

Adult use only. Tiny parts can be swallowed, causing severe trauma. Keep away from kids and pets.

Allergy Warning

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If redness occurs, immediately stop working with magnets and wear gloves.

Caution required

Handle magnets consciously. Their immense force can shock even professionals. Stay alert and do not underestimate their force.

Impact on smartphones

An intense magnetic field interferes with the functioning of magnetometers in smartphones and GPS navigation. Keep magnets near a device to prevent breaking the sensors.

Data carriers

Do not bring magnets near a purse, laptop, or screen. The magnetism can permanently damage these devices and wipe information from cards.

Protective goggles

Neodymium magnets are ceramic materials, which means they are very brittle. Clashing of two magnets will cause them breaking into shards.

Heat warning

Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.

Pacemakers

For implant holders: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Combustion hazard

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Safety First! Need more info? Check our post: Why are neodymium magnets dangerous?