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MPL 40x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020152

GTIN/EAN: 5906301811589

5.00

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

15 g

Magnetization Direction

↑ axial

Load capacity

11.85 kg / 116.27 N

Magnetic Induction

321.37 mT / 3214 Gs

Coating

[NiCuNi] Nickel

check properties »

6.03 ZŁ with VAT / pcs + price for transport

4.90 ZŁ net + 23% VAT / pcs

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Technical - MPL 40x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020152
GTIN/EAN 5906301811589
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 40 mm [±0,1 mm]
Width 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 15 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.85 kg / 116.27 N
Magnetic Induction ~ ? 321.37 mT / 3214 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x5 / 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 modeling of the product - data

The following values represent the result of a engineering simulation. Values were calculated on models for the class Nd2Fe14B. Real-world performance may differ from theoretical values. Please consider these calculations as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
MPL 40x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3212 Gs
321.2 mT
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
 critical level
1 mm 2791 Gs
279.1 mT
 8.95 kg / 19.73 pounds
8947.7 g / 87.8 N
 warning
2 mm 2358 Gs
235.8 mT
 6.38 kg / 14.08 pounds
6384.9 g / 62.6 N
 warning
3 mm 1965 Gs
196.5 mT
 4.43 kg / 9.77 pounds
4432.4 g / 43.5 N
 warning
5 mm 1360 Gs
136.0 mT
 2.12 kg / 4.68 pounds
2122.9 g / 20.8 N
 warning
10 mm 615 Gs
61.5 mT
 0.43 kg / 0.96 pounds
434.1 g / 4.3 N
 low risk
15 mm 329 Gs
32.9 mT
 0.12 kg / 0.27 pounds
124.5 g / 1.2 N
 low risk
20 mm 195 Gs
19.5 mT
 0.04 kg / 0.10 pounds
43.9 g / 0.4 N
 low risk
30 mm 83 Gs
8.3 mT
 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
 low risk
50 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 pounds
0.6 g / 0.0 N
 low risk
Pulling power decreases significantly per each millimeter of gap. Keep in mind that even a microscopic distance (e.g., dirt, varnish, rust) significantly weakens the grip. Neodymiums hold optimally in perfect adhesion; air break nullifies the power. See how flashily the parameters fall, when the magnet does not touch directly to the metal substrate. When designing the assembly, discard additional spacers.

Table 2: Slippage capacity (vertical surface)
MPL 40x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.37 kg / 5.22 pounds
2370.0 g / 23.2 N
1 mm Stal (~0.2) 1.79 kg / 3.95 pounds
1790.0 g / 17.6 N
2 mm Stal (~0.2) 1.28 kg / 2.81 pounds
1276.0 g / 12.5 N
3 mm Stal (~0.2) 0.89 kg / 1.95 pounds
886.0 g / 8.7 N
5 mm Stal (~0.2) 0.42 kg / 0.93 pounds
424.0 g / 4.2 N
10 mm Stal (~0.2) 0.09 kg / 0.19 pounds
86.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
The table below indicates the theoretical holding capacity required to cause the downward movement of the magnet downwards along a upright steel plate (assuming typical friction). The holding force depends on the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MPL 40x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.55 kg / 7.84 pounds
3555.0 g / 34.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.37 kg / 5.22 pounds
2370.0 g / 23.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.19 kg / 2.61 pounds
1185.0 g / 11.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.93 kg / 13.06 pounds
5925.0 g / 58.1 N
When hanging a magnet on a vertical plane (e.g., a board), it you can count on just approx. 1/5 of its maximum pull force. Gravity and a weak degree of grip influence the fact that magnets slip easier than they pull off. Want to create a vertical fastening? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a slippery surface, the element will slip down under a much lighter weight. Using a rubber coating can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 40x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.59 kg / 1.31 pounds
592.5 g / 5.8 N
1 mm
13%
 1.48 kg / 3.27 pounds
1481.3 g / 14.5 N
2 mm
25%
 2.96 kg / 6.53 pounds
2962.5 g / 29.1 N
3 mm
38%
 4.44 kg / 9.80 pounds
4443.8 g / 43.6 N
5 mm
63%
 7.41 kg / 16.33 pounds
7406.3 g / 72.7 N
10 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
11 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
12 mm
100%
 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
A too thin steel is incapable of conduct the entire magnetic field, which wastes potential of the magnet. Should you mount a strong magnet to a weak sheet, the magnetism will penetrate right through and the pull force will drop sharply. To utilize the maximum of this magnet's potential, you require a sufficiently solid element of steel. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the magnet holds weaker. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal resistance (stability) - power drop
MPL 40x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.85 kg / 26.12 pounds
11850.0 g / 116.2 N
 OK
40 °C -2.2% 11.59 kg / 25.55 pounds
11589.3 g / 113.7 N
 OK
60 °C -4.4% 11.33 kg / 24.98 pounds
11328.6 g / 111.1 N
80 °C -6.6% 11.07 kg / 24.40 pounds
11067.9 g / 108.6 N
100 °C -28.8% 8.44 kg / 18.60 pounds
8437.2 g / 82.8 N
Ordinary NdFeB products lose strength after exceeding the maximum temperature. Protect against heat – heat can permanently destroy this magnet. With increasing heat, the neodymium's power temporarily lowers. Avoid using this product near heat sources exceeding its safe range. Too high temperature will result in permanent loss of magnetism.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress compared to rod magnets. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 40x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 25.44 kg / 56.10 pounds
4 569 Gs
3.82 kg / 8.41 pounds
3817 g / 37.4 N
 N/A
1 mm 22.33 kg / 49.22 pounds
6 018 Gs
3.35 kg / 7.38 pounds
3349 g / 32.9 N
 20.09 kg / 44.30 pounds
~0 Gs
2 mm 19.21 kg / 42.36 pounds
5 582 Gs
2.88 kg / 6.35 pounds
2882 g / 28.3 N
 17.29 kg / 38.12 pounds
~0 Gs
3 mm 16.31 kg / 35.96 pounds
5 144 Gs
2.45 kg / 5.39 pounds
2447 g / 24.0 N
 14.68 kg / 32.36 pounds
~0 Gs
5 mm 11.45 kg / 25.23 pounds
4 309 Gs
1.72 kg / 3.78 pounds
1717 g / 16.8 N
 10.30 kg / 22.71 pounds
~0 Gs
10 mm 4.56 kg / 10.05 pounds
2 719 Gs
0.68 kg / 1.51 pounds
684 g / 6.7 N
 4.10 kg / 9.04 pounds
~0 Gs
20 mm 0.93 kg / 2.05 pounds
1 230 Gs
0.14 kg / 0.31 pounds
140 g / 1.4 N
 0.84 kg / 1.85 pounds
~0 Gs
50 mm 0.04 kg / 0.08 pounds
249 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.03 kg / 0.08 pounds
~0 Gs
60 mm 0.02 kg / 0.04 pounds
167 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.03 pounds
~0 Gs
70 mm 0.01 kg / 0.02 pounds
116 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.01 pounds
84 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.01 pounds
62 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
48 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums interact from a wider radius than a magnet and steel combination. The setup of magnet-to-magnet generates a stronger field and a further horizon of operation. Designing a strong closure? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the pinch force is extreme. The levitation is a bit weaker than the attraction, but still impressive.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Figures apply to sliding force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - precautionary measures
MPL 40x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 9.0 cm
Hearing aid 10 Gs (1.0 mT) 7.0 cm
Timepiece 20 Gs (2.0 mT) 5.5 cm
Mobile device 40 Gs (4.0 mT) 4.5 cm
Car key 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field is a large risk to electronics and medical implants. These neodymiums produce a field that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and glass. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
MPL 40x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.99 km/h
(8.05 m/s)
 0.49 J
30 mm 49.12 km/h
(13.64 m/s)
 1.40 J
50 mm 63.39 km/h
(17.61 m/s)
 2.33 J
100 mm 89.64 km/h
(24.90 m/s)
 4.65 J
Magnetic elements are very brittle – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can cause material chips or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when handling with large magnets.

Table 9: Surface protection spec
MPL 40x10x5 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Pc)
MPL 40x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 11 419 Mx 114.2 µWb
Pc Coefficient 0.31 Low (Flat)
Total magnetic flux emitted by the pole surface. Essential parameter in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 40x10x5 / N38

Environment Effective steel pull Effect
Air (land) 11.85 kg Standard
Water (riverbed) 13.57 kg
(+1.72 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.

2. Steel thickness impact

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

3. Temperature resistance

*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) = 0.31

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%
Sustainability
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: 020152-2026
Measurement Calculator
Force (pull)
Field Strength
Insert a number into a field, to see the rest will recalculate in real-time.

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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 40x10x5 mm and a weight of 15 g, guarantees premium class connection. As a block magnet with high power (approx. 11.85 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 11.85 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 40x10x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 40x10x5 / N38, we recommend utilizing strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x10x5 / N38 model is magnetized through the thickness (dimension 5 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (40x10 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 10 mm (width), and 5 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 11.85 kg (force ~116.27 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of neodymium magnets.

Pros

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They have stable power, and over more than ten years their performance decreases symbolically – ~1% (in testing),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • By applying a reflective coating of silver, the element acquires an elegant look,
  • They feature high magnetic induction at the operating surface, which increases their power,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of accurate machining and adjusting to complex needs,
  • Huge importance in high-tech industry – they find application in data components, electromotive mechanisms, medical equipment, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in small systems

Limitations

Drawbacks and weaknesses of neodymium magnets: application proposals
  • At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices are able to complicate diagnosis medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

The specified lifting capacity refers to the limit force, obtained under optimal environment, specifically:
  • with the contact of a yoke made of special test steel, guaranteeing maximum field concentration
  • whose transverse dimension is min. 10 mm
  • with an polished contact surface
  • with direct contact (without paint)
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

Key elements affecting lifting force

Effective lifting capacity impacted by specific conditions, such as (from most important):
  • Air gap (betwixt the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Chemical composition of the base – low-carbon steel attracts best. Higher carbon content reduce magnetic permeability and holding force.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

H&S for magnets
Do not give to children

NdFeB magnets are not suitable for play. Accidental ingestion of multiple magnets can lead to them pinching intestinal walls, which poses a critical condition and necessitates immediate surgery.

Protective goggles

Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Avoid contact if allergic

Studies show that the nickel plating (the usual finish) is a common allergen. If you have an allergy, prevent direct skin contact or choose encased magnets.

Bodily injuries

Mind your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!

Fire warning

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Safe operation

Before starting, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Electronic devices

Powerful magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

Magnetic interference

Be aware: rare earth magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your phone, tablet, and GPS.

Demagnetization risk

Avoid heat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).

Life threat

Individuals with a pacemaker have to maintain an large gap from magnets. The magnetic field can interfere with the operation of the life-saving device.

Safety First! Learn more about hazards in the article: Magnet Safety Guide.