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MP 25x5x27 / N38 - ring magnet

ring magnet

Catalog no 030192

GTIN/EAN: 5906301812098

5.00
Load capacity 18.51 kg / 181.54 N Magnetic Induction 562.34 mT / 5623 Gs
Diameter
25 mm [±0,1 mm]
internal diameter Ø
5 mm [±0,1 mm]
Height
27 mm [±0,1 mm]
Weight
95.43 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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38.36 zł net / pcs

47.18 zł with VAT (23% VAT) / pcs

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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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Technical - MP 25x5x27 / N38 - ring magnet

Specification / characteristics - MP 25x5x27 / N38 - ring magnet

properties
properties values
Cat. no. 030192
GTIN/EAN 5906301812098
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 25 mm [±0,1 mm]
internal diameter Ø 5 mm [±0,1 mm]
Height 27 mm [±0,1 mm]
Weight 95.43 g
Magnetization Direction ↑ axial
Load capacity ~ ? 18.51 kg / 181.54 N
Magnetic Induction ~ ? 562.34 mT / 5623 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MP 25x5x27 / 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 modeling of the product - technical parameters

The following data represent the result of a physical simulation. Values were calculated on algorithms for the material Nd2Fe14B. Actual conditions may deviate from the simulation results. Treat these calculations as a reference point when designing systems.

Table 1: Static force (pull vs gap) - characteristics
MP 25x5x27 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5716 Gs
571.6 mT
 18.51 kg / 40.81 lbs
18510.0 g / 181.6 N
 crushing
1 mm 5288 Gs
528.8 mT
 15.84 kg / 34.92 lbs
15839.8 g / 155.4 N
 crushing
2 mm 4861 Gs
486.1 mT
 13.38 kg / 29.51 lbs
13384.0 g / 131.3 N
 crushing
3 mm 4446 Gs
444.6 mT
 11.20 kg / 24.69 lbs
11198.0 g / 109.9 N
 crushing
5 mm 3677 Gs
367.7 mT
 7.66 kg / 16.88 lbs
7657.5 g / 75.1 N
 warning
10 mm 2216 Gs
221.6 mT
 2.78 kg / 6.13 lbs
2782.1 g / 27.3 N
 warning
15 mm 1354 Gs
135.4 mT
 1.04 kg / 2.29 lbs
1037.8 g / 10.2 N
 safe
20 mm 864 Gs
86.4 mT
 0.42 kg / 0.93 lbs
423.3 g / 4.2 N
 safe
30 mm 405 Gs
40.5 mT
 0.09 kg / 0.21 lbs
93.1 g / 0.9 N
 safe
50 mm 133 Gs
13.3 mT
 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
 safe
Magnetic force drops drastically with every subsequent millimeter of spacing. Keep in mind that every additional insulation layer (e.g., contamination, varnish, dust) noticeably diminishes the holding power. Magnetic products operate most effectively at the point of direct contact; distance nullifies the force. Observe how flashily the load capacity plummet, when the product does not touch directly to the steel surface. When planning the arrangement, discard unnecessary gaps.

Table 2: Sliding hold (vertical surface)
MP 25x5x27 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.70 kg / 8.16 lbs
3702.0 g / 36.3 N
1 mm Stal (~0.2) 3.17 kg / 6.98 lbs
3168.0 g / 31.1 N
2 mm Stal (~0.2) 2.68 kg / 5.90 lbs
2676.0 g / 26.3 N
3 mm Stal (~0.2) 2.24 kg / 4.94 lbs
2240.0 g / 22.0 N
5 mm Stal (~0.2) 1.53 kg / 3.38 lbs
1532.0 g / 15.0 N
10 mm Stal (~0.2) 0.56 kg / 1.23 lbs
556.0 g / 5.5 N
15 mm Stal (~0.2) 0.21 kg / 0.46 lbs
208.0 g / 2.0 N
20 mm Stal (~0.2) 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 lbs
18.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
The table below presents the approximate holding capacity needed to start the downward movement of the magnet down against a upright metal surface (assuming standard friction coefficient). This parameter depends on the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MP 25x5x27 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.55 kg / 12.24 lbs
5553.0 g / 54.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.70 kg / 8.16 lbs
3702.0 g / 36.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.85 kg / 4.08 lbs
1851.0 g / 18.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.26 kg / 20.40 lbs
9255.0 g / 90.8 N
When mounting a holder on a upright plane (e.g., a car body), it will maintain barely about 20%-30% of its maximum pull force. Gravity and a low friction coefficient influence the fact that magnets slide down faster than they pull off. Planning a wall mount? Consider that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the element will slip down under a noticeably lighter cargo. Using a rubber layer can significantly improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MP 25x5x27 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.93 kg / 2.04 lbs
925.5 g / 9.1 N
1 mm
13%
 2.31 kg / 5.10 lbs
2313.8 g / 22.7 N
2 mm
25%
 4.63 kg / 10.20 lbs
4627.5 g / 45.4 N
3 mm
38%
 6.94 kg / 15.30 lbs
6941.3 g / 68.1 N
5 mm
63%
 11.57 kg / 25.50 lbs
11568.8 g / 113.5 N
10 mm
100%
 18.51 kg / 40.81 lbs
18510.0 g / 181.6 N
11 mm
100%
 18.51 kg / 40.81 lbs
18510.0 g / 181.6 N
12 mm
100%
 18.51 kg / 40.81 lbs
18510.0 g / 181.6 N
A thin metal plate is unable to focus the entire magnetic field, which wastes potential of the magnet. If you install a neodymium to a too thin substrate, the field will penetrate right through and the attraction force will be weaker. To achieve the maximum of this magnet's potential, you need a suitably thick piece of metal. The saturation effect means that on sheet metal structures (e.g., thin profiles), the holder holds weaker. We advise picking the steel dimension according to the table below.

Table 5: Working in heat (material behavior) - power drop
MP 25x5x27 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 18.51 kg / 40.81 lbs
18510.0 g / 181.6 N
 OK
40 °C -2.2% 18.10 kg / 39.91 lbs
18102.8 g / 177.6 N
 OK
60 °C -4.4% 17.70 kg / 39.01 lbs
17695.6 g / 173.6 N
 OK
80 °C -6.6% 17.29 kg / 38.11 lbs
17288.3 g / 169.6 N
100 °C -28.8% 13.18 kg / 29.05 lbs
13179.1 g / 129.3 N
Standard neodymium magnets irreversibly lose power past the thermal threshold. Protect against heat – high temperature can permanently damage this product. As the temperature rises, the neodymium's force briefly drops. Refrain from using this product close to ovens exceeding its operating temperature limit. Ignoring the limit will lead to destruction of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MP 25x5x27 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.99 kg / 30.83 lbs
6 064 Gs
2.10 kg / 4.62 lbs
2098 g / 20.6 N
 N/A
1 mm 12.97 kg / 28.59 lbs
11 008 Gs
1.94 kg / 4.29 lbs
1945 g / 19.1 N
 11.67 kg / 25.73 lbs
~0 Gs
2 mm 11.97 kg / 26.39 lbs
10 576 Gs
1.80 kg / 3.96 lbs
1795 g / 17.6 N
 10.77 kg / 23.75 lbs
~0 Gs
3 mm 11.02 kg / 24.29 lbs
10 146 Gs
1.65 kg / 3.64 lbs
1652 g / 16.2 N
 9.91 kg / 21.86 lbs
~0 Gs
5 mm 9.26 kg / 20.42 lbs
9 303 Gs
1.39 kg / 3.06 lbs
1389 g / 13.6 N
 8.33 kg / 18.37 lbs
~0 Gs
10 mm 5.79 kg / 12.76 lbs
7 353 Gs
0.87 kg / 1.91 lbs
868 g / 8.5 N
 5.21 kg / 11.48 lbs
~0 Gs
20 mm 2.10 kg / 4.63 lbs
4 432 Gs
0.32 kg / 0.70 lbs
315 g / 3.1 N
 1.89 kg / 4.17 lbs
~0 Gs
50 mm 0.14 kg / 0.32 lbs
1 159 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
 0.13 kg / 0.29 lbs
~0 Gs
60 mm 0.07 kg / 0.16 lbs
811 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
 0.06 kg / 0.14 lbs
~0 Gs
70 mm 0.04 kg / 0.08 lbs
589 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.03 kg / 0.07 lbs
~0 Gs
80 mm 0.02 kg / 0.05 lbs
440 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
90 mm 0.01 kg / 0.03 lbs
338 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
265 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two strong neodymiums attract each other from a much further distance than a neodymium and metal setup. The setup of two magnets creates a more powerful interaction and a larger range of performance. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a steel. Remember that when attracting two neodymiums, the collision energy is massive. The levitation is a bit weaker than the attraction, but still large.
*Flux density for N-N configuration is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
Attention: Results show friction force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - precautionary measures
MP 25x5x27 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 18.0 cm
Hearing aid 10 Gs (1.0 mT) 14.0 cm
Timepiece 20 Gs (2.0 mT) 11.0 cm
Mobile device 40 Gs (4.0 mT) 8.5 cm
Car key 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Powerful magnet radiation poses a large risk to electronics and pacemakers. These neodymiums generate a field that disrupts operation of sensitive medical devices. Be aware: the unseen radiation passes through tissues and glass. Increased vigilance must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MP 25x5x27 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.21 km/h
(4.23 m/s)
 0.85 J
30 mm 16.42 km/h
(4.56 m/s)
 0.99 J
50 mm 16.47 km/h
(4.58 m/s)
 1.00 J
100 mm 16.48 km/h
(4.58 m/s)
 1.00 J
NdFeB products are prone to chipping – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or injury to skin. Be sure to control the product during installation so it doesn't hit with great force against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (durability)
MP 25x5x27 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MP 25x5x27 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 917 Mx 49.2 µWb
Pc Coefficient 1.40 High (Stable)
Total magnetic flux passing through the pole surface. Key data in coil applications as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
MP 25x5x27 / N38

Environment Effective steel pull Effect
Air (land) 18.51 kg Standard
Water (riverbed) 21.19 kg
(+2.68 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)

*Note: On a vertical wall, the magnet retains merely ~20% of its max power.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Heat tolerance

*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) = 1.40

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical specification and ecology

Chemical composition

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: 030192-2026
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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. Mounting is clean and reversible, unlike gluing. This product with a force of 18.51 kg works great as a cabinet closure, speaker holder, or mounting element in devices.
This material behaves more like porcelain than steel, so it doesn't forgive mistakes during mounting. One turn too many can destroy the magnet, so do it slowly. The flat screw head should evenly press the magnet. Remember: cracking during assembly results from material properties, not a product defect.
These magnets are coated with standard Ni-Cu-Ni plating, which protects them in indoor conditions, but does not ensure full waterproofing. 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 magnets in hermetic housing or additional protection with varnish.
A screw or bolt with a thread diameter smaller than 5 mm fits this model. For magnets with a straight hole, a conical head can act like a wedge and burst the magnet. Aesthetic mounting requires selecting the appropriate head size.
The presented product is a ring magnet with dimensions Ø25 mm (outer diameter) and height 27 mm. The pulling force of this model is an impressive 18.51 kg, which translates to 181.54 N in newtons. The mounting hole diameter is precisely 5 mm.
The poles are located on the planes with holes, not on the sides of the ring. In the case of connecting two rings, make sure one is turned the right way. We do not offer paired sets with marked poles in this category, but they are easy to match manually.

Advantages as well as disadvantages of rare earth magnets.

Strengths

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even over approximately 10 years – the drop in strength is only ~1% (according to tests),
  • They are noted for resistance to demagnetization induced by external field influence,
  • In other words, due to the glossy layer of nickel, the element gains a professional look,
  • Neodymium magnets achieve maximum magnetic induction on a their surface, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of precise creating as well as adapting to precise requirements,
  • Huge importance in future technologies – they are commonly used in computer drives, electric motors, precision medical tools, as well as industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Limitations

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • Due to limitations in realizing nuts and complex forms in magnets, we propose using cover - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these products can disrupt the diagnostic process 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

Magnetic strength at its maximum – what it depends on?

Information about lifting capacity was determined for ideal contact conditions, including:
  • using a plate made of low-carbon steel, serving as a ideal flux conductor
  • with a cross-section no less than 10 mm
  • with a plane cleaned and smooth
  • without the slightest air gap between the magnet and steel
  • under axial force vector (90-degree angle)
  • at conditions approx. 20°C

Lifting capacity in real conditions – factors

In practice, the actual lifting capacity is determined by several key aspects, presented from the most important:
  • Distance – existence of any layer (paint, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Material type – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate lowers the lifting capacity.

H&S for magnets
Choking Hazard

Always keep magnets away from children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are tragic.

Allergic reactions

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, cease working with magnets and wear gloves.

Impact on smartphones

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Conscious usage

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

Keep away from computers

Device Safety: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, timepieces).

Magnets are brittle

Protect your eyes. Magnets can fracture upon violent connection, launching shards into the air. Eye protection is mandatory.

Medical interference

Warning for patients: Strong magnetic fields affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Thermal limits

Control the heat. Heating the magnet to high heat will ruin its properties and strength.

Combustion hazard

Dust created during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Finger safety

Large magnets can break fingers instantly. Do not place your hand betwixt two attracting surfaces.

Important! Need more info? Check our post: Are neodymium magnets dangerous?