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MW 4x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010075

GTIN/EAN: 5906301810742

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

0.94 g

Magnetization Direction

↑ axial

Load capacity

0.32 kg / 3.16 N

Magnetic Induction

606.05 mT / 6061 Gs

Coating

[NiCuNi] Nickel

check specifications »

0.800 ZŁ with VAT / pcs + price for transport

0.650 ZŁ net + 23% VAT / pcs

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical parameters - MW 4x10 / N38 - cylindrical magnet

Specification / characteristics - MW 4x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010075
GTIN/EAN 5906301810742
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 4 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 0.94 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.32 kg / 3.16 N
Magnetic Induction ~ ? 606.05 mT / 6061 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x10 / N38 - cylindrical magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Engineering simulation of the assembly - data

The following data represent the outcome of a engineering analysis. Results were calculated on models for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - interaction chart
MW 4x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6049 Gs
604.9 mT
 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
 safe
1 mm 3327 Gs
332.7 mT
 0.10 kg / 0.21 pounds
96.8 g / 0.9 N
 safe
2 mm 1732 Gs
173.2 mT
 0.03 kg / 0.06 pounds
26.2 g / 0.3 N
 safe
3 mm 969 Gs
96.9 mT
 0.01 kg / 0.02 pounds
8.2 g / 0.1 N
 safe
5 mm 389 Gs
38.9 mT
 0.00 kg / 0.00 pounds
1.3 g / 0.0 N
 safe
10 mm 90 Gs
9.0 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 safe
15 mm 35 Gs
3.5 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
20 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
30 mm 6 Gs
0.6 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
50 mm 2 Gs
0.2 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Grip strength decreases sharply with every subsequent millimeter of spacing. Note that even the smallest gap (e.g., dirt, varnish, dust) strongly weakens the grip. Magnets work optimally at the point of direct contact; distance kills the power. Analyze how quickly the pull force fall, when the magnet does not adhere tightly to the metal substrate. When calculating the mounting, eliminate unnecessary gaps.

Table 2: Sliding load (vertical surface)
MW 4x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.06 kg / 0.14 pounds
64.0 g / 0.6 N
1 mm Stal (~0.2) 0.02 kg / 0.04 pounds
20.0 g / 0.2 N
2 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section shows the approximate force necessary to start the downward movement of the magnet downwards against a vertical steel wall (assuming standard friction). The holding force is a function of the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 4x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.10 kg / 0.21 pounds
96.0 g / 0.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.06 kg / 0.14 pounds
64.0 g / 0.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.03 kg / 0.07 pounds
32.0 g / 0.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
When mounting a element on a vertical wall (e.g., a car body), it will maintain only about 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient mean that holders slip faster than they pop off the substrate. Planning a hanger? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the element will give way down under a much lighter cargo. Application of an anti-slip layer can drastically raise the stability.

Table 4: Steel thickness (saturation) - power losses
MW 4x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.03 kg / 0.07 pounds
32.0 g / 0.3 N
1 mm
25%
 0.08 kg / 0.18 pounds
80.0 g / 0.8 N
2 mm
50%
 0.16 kg / 0.35 pounds
160.0 g / 1.6 N
3 mm
75%
 0.24 kg / 0.53 pounds
240.0 g / 2.4 N
5 mm
100%
 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
10 mm
100%
 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
11 mm
100%
 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
12 mm
100%
 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
A too thin steel is incapable of focus the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To utilize the maximum of this neodymium's power, you require a sufficiently solid piece of metal. The saturation effect means that on sheet metal structures (e.g., thin profiles), the holder shows lower pull force. We advise picking the steel cross-section from these parameters.

Table 5: Thermal stability (stability) - thermal limit
MW 4x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.32 kg / 0.71 pounds
320.0 g / 3.1 N
 OK
40 °C -2.2% 0.31 kg / 0.69 pounds
313.0 g / 3.1 N
 OK
60 °C -4.4% 0.31 kg / 0.67 pounds
305.9 g / 3.0 N
 OK
80 °C -6.6% 0.30 kg / 0.66 pounds
298.9 g / 2.9 N
100 °C -28.8% 0.23 kg / 0.50 pounds
227.8 g / 2.2 N
Ordinary NdFeB products change their properties strength after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly demagnetize this product. As the temperature rises, the magnet's power briefly lowers. Refrain from using this magnet near heat sources higher than its safe range. Ignoring the limit will lead to permanent loss of magnetism.
*Important note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 4x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.83 kg / 6.25 pounds
6 138 Gs
0.43 kg / 0.94 pounds
425 g / 4.2 N
 N/A
1 mm 1.63 kg / 3.59 pounds
9 174 Gs
0.24 kg / 0.54 pounds
244 g / 2.4 N
 1.47 kg / 3.23 pounds
~0 Gs
2 mm 0.86 kg / 1.89 pounds
6 655 Gs
0.13 kg / 0.28 pounds
129 g / 1.3 N
 0.77 kg / 1.70 pounds
~0 Gs
3 mm 0.44 kg / 0.97 pounds
4 777 Gs
0.07 kg / 0.15 pounds
66 g / 0.7 N
 0.40 kg / 0.88 pounds
~0 Gs
5 mm 0.13 kg / 0.28 pounds
2 561 Gs
0.02 kg / 0.04 pounds
19 g / 0.2 N
 0.11 kg / 0.25 pounds
~0 Gs
10 mm 0.01 kg / 0.03 pounds
778 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
179 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
19 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
12 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
8 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
6 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
4 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
3 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and sheet setup. The setup of magnet-to-magnet produces a massive flux and a wider radius of performance. Want to build a strong closure? Apply two magnets instead of one magnet and a steel. Remember that when attracting two neodymiums, the impact force is massive. The repulsion force is slightly lower than the connection force, but still significant.
*Flux density between like poles drops to ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Note: Estimates apply to friction force of two same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 4x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.5 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Mechanical watch 20 Gs (2.0 mT) 2.0 cm
Mobile device 40 Gs (4.0 mT) 1.5 cm
Remote 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
A strong magnetic field poses a real danger to electronics and medical implants. These neodymiums produce a flux that prevents correct functioning of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and housings. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MW 4x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.61 km/h
(5.17 m/s)
 0.01 J
30 mm 32.23 km/h
(8.95 m/s)
 0.04 J
50 mm 41.61 km/h
(11.56 m/s)
 0.06 J
100 mm 58.84 km/h
(16.35 m/s)
 0.13 J
Neodymium magnets are delicate – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Kinetic force can cause material chips or painful pinches to fingers. Always hold the magnet during installation so it doesn't hit with great force against the metal. A collision at high speed means shattering of the neodymium. Wear safety glasses when handling with large magnets.

Table 9: Anti-corrosion coating durability
MW 4x10 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MW 4x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 864 Mx 8.6 µWb
Pc Coefficient 1.31 High (Stable)
Flux value emitted by the pole surface. Key data for generator designers as well as sensors. Pc value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MW 4x10 / N38

Environment Effective steel pull Effect
Air (land) 0.32 kg Standard
Water (riverbed) 0.37 kg
(+0.05 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Note: On a vertical wall, the magnet retains only ~20% of its nominal pull.

2. Plate thickness effect

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.31

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%
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: 010075-2026
Magnet Unit Converter
Force (pull)
Field Strength
Input your value in a single slot to see the conversion in the other units immediately.

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The presented product is an exceptionally strong cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø4x10 mm, guarantees the highest energy density. The MW 4x10 / N38 component boasts high dimensional repeatability and professional build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 0.32 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 3.16 N with a weight of only 0.94 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need the strongest magnets in the same volume (Ø4x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 4 mm and height 10 mm. The key parameter here is the holding force amounting to approximately 0.32 kg (force ~3.16 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 4 mm. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Advantages as well as disadvantages of neodymium magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
  • They feature excellent resistance to weakening of magnetic properties as a result of external magnetic sources,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnetic induction on the working part of the magnet remains impressive,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures reaching 230°C and above...
  • In view of the ability of precise forming and customization to unique projects, magnetic components can be modeled in a wide range of geometric configurations, which expands the range of possible applications,
  • Key role in modern technologies – they are utilized in computer drives, electromotive mechanisms, precision medical tools, as well as technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small components of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Maximum holding power of the magnet – what it depends on?

The declared magnet strength represents the maximum value, measured under laboratory conditions, meaning:
  • on a block made of structural steel, effectively closing the magnetic flux
  • whose thickness is min. 10 mm
  • characterized by smoothness
  • without any clearance between the magnet and steel
  • during detachment in a direction vertical to the plane
  • in temp. approx. 20°C

What influences lifting capacity in practice

During everyday use, the real power is determined by a number of factors, presented from the most important:
  • Distance – the presence of any layer (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Load vector – maximum parameter is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Alloy steels decrease magnetic properties and holding force.
  • Base smoothness – the more even the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with neodymium magnets
Data carriers

Do not bring magnets close to a purse, computer, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Danger to the youngest

These products are not suitable for play. Accidental ingestion of a few magnets can lead to them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.

Crushing risk

Protect your hands. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Power loss in heat

Do not overheat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Do not underestimate power

Before starting, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Beware of splinters

Neodymium magnets are ceramic materials, meaning they are fragile like glass. Impact of two magnets will cause them cracking into shards.

Flammability

Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this may cause fire.

Health Danger

People with a ICD must keep an absolute distance from magnets. The magnetic field can stop the operation of the implant.

Precision electronics

An intense magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Keep magnets close to a smartphone to prevent breaking the sensors.

Avoid contact if allergic

Some people experience a contact allergy to Ni, which is the standard coating for neodymium magnets. Extended handling can result in a rash. It is best to wear protective gloves.

Safety First! Looking for details? Check our post: Are neodymium magnets dangerous?