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MPL 15x2x30 / N38 - lamellar magnet

lamellar magnet

Catalog no 020121

GTIN/EAN: 5906301811275

5.00

length

15 mm [±0,1 mm]

Width

2 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

6.75 g

Magnetization Direction

→ diametrical

Load capacity

0.68 kg / 6.68 N

Magnetic Induction

614.34 mT / 6143 Gs

Coating

[NiCuNi] Nickel

technical specifications »

4.75 ZŁ with VAT / pcs + price for transport

3.86 ZŁ net + 23% VAT / pcs

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Detailed specification - MPL 15x2x30 / N38 - lamellar magnet

Specification / characteristics - MPL 15x2x30 / N38 - lamellar magnet

properties
properties values
Cat. no. 020121
GTIN/EAN 5906301811275
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 15 mm [±0,1 mm]
Width 2 mm [±0,1 mm]
Height 30 mm [±0,1 mm]
Weight 6.75 g
Magnetization Direction → diametrical
Load capacity ~ ? 0.68 kg / 6.68 N
Magnetic Induction ~ ? 614.34 mT / 6143 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 15x2x30 / 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

Physical simulation of the magnet - technical parameters

The following data represent the outcome of a mathematical simulation. Values were calculated on models for the material Nd2Fe14B. Operational conditions may differ from theoretical values. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs distance) - interaction chart
MPL 15x2x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6128 Gs
612.8 mT
 0.68 kg / 1.50 LBS
680.0 g / 6.7 N
 safe
1 mm 3036 Gs
303.6 mT
 0.17 kg / 0.37 LBS
166.8 g / 1.6 N
 safe
2 mm 1736 Gs
173.6 mT
 0.05 kg / 0.12 LBS
54.5 g / 0.5 N
 safe
3 mm 1150 Gs
115.0 mT
 0.02 kg / 0.05 LBS
23.9 g / 0.2 N
 safe
5 mm 623 Gs
62.3 mT
 0.01 kg / 0.02 LBS
7.0 g / 0.1 N
 safe
10 mm 218 Gs
21.8 mT
 0.00 kg / 0.00 LBS
0.9 g / 0.0 N
 safe
15 mm 103 Gs
10.3 mT
 0.00 kg / 0.00 LBS
0.2 g / 0.0 N
 safe
20 mm 58 Gs
5.8 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 safe
30 mm 24 Gs
2.4 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
50 mm 7 Gs
0.7 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
Magnetic force weakens sharply with every subsequent millimeter of spacing. Note that even the smallest gap (e.g., dirt, paint, dust) significantly reduces the pull force. Neodymiums work optimally during direct contact; distance kills the power. Observe how rapidly the parameters drop, when the magnet does not touch directly to the metal substrate. When designing the mounting, avoid redundant distances.

Table 2: Vertical force (wall)
MPL 15x2x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.14 kg / 0.30 LBS
136.0 g / 1.3 N
1 mm Stal (~0.2) 0.03 kg / 0.07 LBS
34.0 g / 0.3 N
2 mm Stal (~0.2) 0.01 kg / 0.02 LBS
10.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 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 theoretical force necessary to cause the sliding of the magnet down on a vertical steel plate (considering typical friction). This parameter is relative to the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 15x2x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.20 kg / 0.45 LBS
204.0 g / 2.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.14 kg / 0.30 LBS
136.0 g / 1.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.07 kg / 0.15 LBS
68.0 g / 0.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
When hanging a holder on a upright wall (e.g., a fridge), it will maintain barely about 1/5 of nominal attraction strength. Gravitational force as well as a weak degree of grip cause that products slide down faster than they detach. Designing a vertical fastening? Note that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the element will slide down under a noticeably lighter weight. Utilizing a rubberized pad can effectively increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 15x2x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.07 kg / 0.15 LBS
68.0 g / 0.7 N
1 mm
25%
 0.17 kg / 0.37 LBS
170.0 g / 1.7 N
2 mm
50%
 0.34 kg / 0.75 LBS
340.0 g / 3.3 N
3 mm
75%
 0.51 kg / 1.12 LBS
510.0 g / 5.0 N
5 mm
100%
 0.68 kg / 1.50 LBS
680.0 g / 6.7 N
10 mm
100%
 0.68 kg / 1.50 LBS
680.0 g / 6.7 N
11 mm
100%
 0.68 kg / 1.50 LBS
680.0 g / 6.7 N
12 mm
100%
 0.68 kg / 1.50 LBS
680.0 g / 6.7 N
A too thin steel is unable to focus the full magnetic flux, which weakens actual performance of the magnet. Should you install a neodymium to a too thin substrate, the magnetism will penetrate right through and the attraction force will be weaker. To utilize 100% of this neodymium's power, you need a suitably thick piece of metal. The saturation phenomenon causes that on delicate walls (e.g., thin profiles), the holder works worse. We recommend selecting the steel dimension based on the following data.

Table 5: Working in heat (stability) - resistance threshold
MPL 15x2x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.68 kg / 1.50 LBS
680.0 g / 6.7 N
 OK
40 °C -2.2% 0.67 kg / 1.47 LBS
665.0 g / 6.5 N
 OK
60 °C -4.4% 0.65 kg / 1.43 LBS
650.1 g / 6.4 N
 OK
80 °C -6.6% 0.64 kg / 1.40 LBS
635.1 g / 6.2 N
100 °C -28.8% 0.48 kg / 1.07 LBS
484.2 g / 4.7 N
Standard neodymium magnets lose strength past the thermal threshold. Watch out for overheating – excessive heat can irreversibly damage this magnet. With increasing heat, the neodymium's force temporarily drops. Do not use this product close to ovens higher than its safe range. Too high temperature will result in destruction of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (pancake types) risk losing magnetic properties under lower heat stress than taller cylinders. Warning indicator in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MPL 15x2x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 6.95 kg / 15.31 LBS
6 152 Gs
1.04 kg / 2.30 LBS
1042 g / 10.2 N
 N/A
1 mm 3.45 kg / 7.62 LBS
8 643 Gs
0.52 kg / 1.14 LBS
518 g / 5.1 N
 3.11 kg / 6.85 LBS
~0 Gs
2 mm 1.70 kg / 3.76 LBS
6 071 Gs
0.26 kg / 0.56 LBS
256 g / 2.5 N
 1.53 kg / 3.38 LBS
~0 Gs
3 mm 0.93 kg / 2.05 LBS
4 482 Gs
0.14 kg / 0.31 LBS
139 g / 1.4 N
 0.84 kg / 1.84 LBS
~0 Gs
5 mm 0.36 kg / 0.79 LBS
2 788 Gs
0.05 kg / 0.12 LBS
54 g / 0.5 N
 0.32 kg / 0.71 LBS
~0 Gs
10 mm 0.07 kg / 0.16 LBS
1 247 Gs
0.01 kg / 0.02 LBS
11 g / 0.1 N
 0.06 kg / 0.14 LBS
~0 Gs
20 mm 0.01 kg / 0.02 LBS
435 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
71 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
47 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
33 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
24 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
18 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
14 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and steel setup. The connection of two magnets generates a stronger field and a further horizon of operation. Planning to create a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the collision energy is massive. The levitation is slightly lower than the connection force, but still significant.
*Flux density in repulsion mode reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
Attention: Figures apply to friction force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - warnings
MPL 15x2x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Timepiece 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Car key 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field is a large risk to electronic devices as well as medical implants. These neodymiums produce a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field acts through matter and glass. Special caution must be exercised by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
MPL 15x2x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 10.13 km/h
(2.81 m/s)
 0.03 J
30 mm 17.53 km/h
(4.87 m/s)
 0.08 J
50 mm 22.63 km/h
(6.29 m/s)
 0.13 J
100 mm 32.01 km/h
(8.89 m/s)
 0.27 J
NdFeB products are delicate – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can cause material chips or painful pinches to fingers. Always hold the magnet during bringing near metal 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 playing with large magnets.

Table 9: Corrosion resistance
MPL 15x2x30 / 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: Electrical data (Flux)
MPL 15x2x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 210 Mx 22.1 µWb
Pc Coefficient 1.54 High (Stable)
Flux value passing through the magnet pole. Key data when building generators as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 15x2x30 / N38

Environment Effective steel pull Effect
Air (land) 0.68 kg Standard
Water (riverbed) 0.78 kg
(+0.10 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!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

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

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely reduces the holding force.

3. Thermal stability

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.54

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.

Engineering data and GPSR
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%
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: 020121-2026
Quick Unit Converter
Force (pull)
Magnetic Induction
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Component MPL 15x2x30 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 6.68 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is shifting the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 15x2x30 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 15x2x30 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 0.68 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 15x2x30 / N38 model is magnetized axially (dimension 30 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
The presented product is a neodymium magnet with precisely defined parameters: 15 mm (length), 2 mm (width), and 30 mm (thickness). It is a magnetic block with dimensions 15x2x30 mm and a self-weight of 6.75 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of rare earth magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • By using a shiny coating of nickel, the element acquires an proper look,
  • Magnetic induction on the working layer of the magnet turns out to be extremely intense,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Considering the possibility of precise forming and customization to custom solutions, NdFeB magnets can be manufactured in a wide range of shapes and sizes, which makes them more universal,
  • Wide application in high-tech industry – they find application in magnetic memories, brushless drives, advanced medical instruments, also other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of creating threads in the magnet and complicated shapes - recommended is casing - magnet mounting.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these magnets are able to complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Holding force characteristics

Best holding force of the magnet in ideal parameters – what affects it?

The declared magnet strength represents the limit force, measured under laboratory conditions, specifically:
  • with the application of a yoke made of low-carbon steel, ensuring maximum field concentration
  • with a cross-section no less than 10 mm
  • characterized by lack of roughness
  • with direct contact (without coatings)
  • during detachment in a direction vertical to the mounting surface
  • at standard ambient temperature

Key elements affecting lifting force

Holding efficiency is influenced by working environment parameters, such as (from most important):
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Direction of force – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Base smoothness – the more even 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 lose power, and in frost gain strength (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate decreases the holding force.

H&S for magnets
Shattering risk

Watch out for shards. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Allergic reactions

Nickel alert: The Ni-Cu-Ni coating contains nickel. If an allergic reaction occurs, cease handling magnets and use protective gear.

Thermal limits

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

Fire warning

Machining of NdFeB material carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Protect data

Avoid bringing magnets close to a wallet, computer, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.

No play value

NdFeB magnets are not toys. Swallowing multiple magnets may result in them connecting inside the digestive tract, which constitutes a direct threat to life and necessitates urgent medical intervention.

Bodily injuries

Pinching hazard: The pulling power is so great that it can cause blood blisters, crushing, and broken bones. Protective gloves are recommended.

Threat to navigation

Remember: rare earth magnets generate a field that interferes with precision electronics. Keep a safe distance from your phone, device, and GPS.

Do not underestimate power

Exercise caution. Neodymium magnets act from a long distance and snap with huge force, often quicker than you can move away.

Implant safety

For implant holders: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

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