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MW 20x1.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010039

GTIN/EAN: 5906301810384

5.00

Diameter Ø

20 mm [±0,1 mm]

Height

1.5 mm [±0,1 mm]

Weight

3.53 g

Magnetization Direction

↑ axial

Load capacity

0.97 kg / 9.50 N

Magnetic Induction

91.96 mT / 920 Gs

Coating

[NiCuNi] Nickel

technical specifications »

1.574 ZŁ with VAT / pcs + price for transport

1.280 ZŁ net + 23% VAT / pcs

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Technical details - MW 20x1.5 / N38 - cylindrical magnet

Specification / characteristics - MW 20x1.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010039
GTIN/EAN 5906301810384
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 20 mm [±0,1 mm]
Height 1.5 mm [±0,1 mm]
Weight 3.53 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.97 kg / 9.50 N
Magnetic Induction ~ ? 91.96 mT / 920 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x1.5 / 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 modeling of the magnet - technical parameters

The following information represent the result of a engineering calculation. Values were calculated on models for the material Nd2Fe14B. Actual performance might slightly differ from theoretical values. Treat these data as a reference point for designers.

Table 1: Static force (pull vs distance) - interaction chart
MW 20x1.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 920 Gs
92.0 mT
 0.97 kg / 2.14 lbs
970.0 g / 9.5 N
 weak grip
1 mm 887 Gs
88.7 mT
 0.90 kg / 1.99 lbs
902.2 g / 8.9 N
 weak grip
2 mm 832 Gs
83.2 mT
 0.79 kg / 1.75 lbs
794.6 g / 7.8 N
 weak grip
3 mm 763 Gs
76.3 mT
 0.67 kg / 1.47 lbs
667.4 g / 6.5 N
 weak grip
5 mm 606 Gs
60.6 mT
 0.42 kg / 0.93 lbs
421.6 g / 4.1 N
 weak grip
10 mm 294 Gs
29.4 mT
 0.10 kg / 0.22 lbs
99.5 g / 1.0 N
 weak grip
15 mm 144 Gs
14.4 mT
 0.02 kg / 0.05 lbs
23.6 g / 0.2 N
 weak grip
20 mm 76 Gs
7.6 mT
 0.01 kg / 0.01 lbs
6.7 g / 0.1 N
 weak grip
30 mm 28 Gs
2.8 mT
 0.00 kg / 0.00 lbs
0.9 g / 0.0 N
 weak grip
50 mm 7 Gs
0.7 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
Magnetic force drops sharply with every subsequent millimeter of gap. Remember that even a microscopic distance (e.g., contamination, paint, dust) significantly diminishes the holding power. Neodymiums work strongest at the point of direct contact; gap drastically cuts the power. Observe how flashily the load capacity fall, when the magnet does not touch tightly to the metal substrate. When calculating the mounting, eliminate additional spacers.

Table 2: Shear hold (wall)
MW 20x1.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.19 kg / 0.43 lbs
194.0 g / 1.9 N
1 mm Stal (~0.2) 0.18 kg / 0.40 lbs
180.0 g / 1.8 N
2 mm Stal (~0.2) 0.16 kg / 0.35 lbs
158.0 g / 1.5 N
3 mm Stal (~0.2) 0.13 kg / 0.30 lbs
134.0 g / 1.3 N
5 mm Stal (~0.2) 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
10 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below presents the theoretical holding capacity required to start the sliding of the magnet downwards against a upright steel plate (considering typical friction). This parameter is a function of the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 20x1.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.29 kg / 0.64 lbs
291.0 g / 2.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.19 kg / 0.43 lbs
194.0 g / 1.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.10 kg / 0.21 lbs
97.0 g / 1.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.49 kg / 1.07 lbs
485.0 g / 4.8 N
When hanging a element on a vertical plane (e.g., a fridge), it will maintain only approx. 20%-30% of its nominal power. Gravitational force and a low friction coefficient mean that holders move down easier than they pull off. Planning a wall mount? Note that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the holder will slip down under a noticeably lighter weight. Application of an anti-slip coating can significantly raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MW 20x1.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.10 kg / 0.21 lbs
97.0 g / 1.0 N
1 mm
25%
 0.24 kg / 0.53 lbs
242.5 g / 2.4 N
2 mm
50%
 0.49 kg / 1.07 lbs
485.0 g / 4.8 N
3 mm
75%
 0.73 kg / 1.60 lbs
727.5 g / 7.1 N
5 mm
100%
 0.97 kg / 2.14 lbs
970.0 g / 9.5 N
10 mm
100%
 0.97 kg / 2.14 lbs
970.0 g / 9.5 N
11 mm
100%
 0.97 kg / 2.14 lbs
970.0 g / 9.5 N
12 mm
100%
 0.97 kg / 2.14 lbs
970.0 g / 9.5 N
A thin metal plate is incapable of absorb the entire magnetic field, which squanders power of the magnet. Should you attach a powerful product to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To squeeze 100% of this magnet's power, you need a suitably thick element of metal. The saturation effect means that on sheet metal structures (e.g., car bodies), the holder holds weaker. We recommend selecting the steel thickness based on the following data.

Table 5: Working in heat (material behavior) - power drop
MW 20x1.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.97 kg / 2.14 lbs
970.0 g / 9.5 N
 OK
40 °C -2.2% 0.95 kg / 2.09 lbs
948.7 g / 9.3 N
 OK
60 °C -4.4% 0.93 kg / 2.04 lbs
927.3 g / 9.1 N
80 °C -6.6% 0.91 kg / 2.00 lbs
906.0 g / 8.9 N
100 °C -28.8% 0.69 kg / 1.52 lbs
690.6 g / 6.8 N
Ordinary NdFeB products lose strength after exceeding the maximum temperature. Watch out for overheating – heat can permanently destroy this magnet. As the temperature rises, the magnet's power temporarily lowers. Refrain from using this product near heat sources exceeding its safe range. Ignoring the limit will lead to irreversible degradation of magnetic properties.
*Important note: Temperature resistance 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 points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 20x1.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.64 kg / 3.61 lbs
1 781 Gs
0.25 kg / 0.54 lbs
246 g / 2.4 N
 N/A
1 mm 1.59 kg / 3.51 lbs
1 813 Gs
0.24 kg / 0.53 lbs
239 g / 2.3 N
 1.43 kg / 3.16 lbs
~0 Gs
2 mm 1.52 kg / 3.36 lbs
1 774 Gs
0.23 kg / 0.50 lbs
228 g / 2.2 N
 1.37 kg / 3.02 lbs
~0 Gs
3 mm 1.44 kg / 3.17 lbs
1 724 Gs
0.22 kg / 0.48 lbs
216 g / 2.1 N
 1.29 kg / 2.85 lbs
~0 Gs
5 mm 1.24 kg / 2.73 lbs
1 598 Gs
0.19 kg / 0.41 lbs
185 g / 1.8 N
 1.11 kg / 2.45 lbs
~0 Gs
10 mm 0.71 kg / 1.57 lbs
1 212 Gs
0.11 kg / 0.24 lbs
107 g / 1.0 N
 0.64 kg / 1.41 lbs
~0 Gs
20 mm 0.17 kg / 0.37 lbs
589 Gs
0.03 kg / 0.06 lbs
25 g / 0.2 N
 0.15 kg / 0.33 lbs
~0 Gs
50 mm 0.00 kg / 0.01 lbs
88 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
55 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
36 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
25 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
13 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a wider radius than a magnet and steel setup. Such a system of two magnets creates a more powerful interaction and a larger range of operation. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the collision energy is massive. The repulsion force is a bit weaker than the connection force, but still impressive.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Important: Estimates demonstrate friction force of a pair of matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - warnings
MW 20x1.5 / 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) 3.0 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
Powerful magnet radiation poses a large risk to IT equipment and pacemakers. These magnets generate a flux that prevents correct functioning of digital equipment. Notice: the invisible magnetic field penetrates the body and housings. Special caution must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MW 20x1.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.76 km/h
(4.93 m/s)
 0.04 J
30 mm 28.97 km/h
(8.05 m/s)
 0.11 J
50 mm 37.38 km/h
(10.38 m/s)
 0.19 J
100 mm 52.87 km/h
(14.69 m/s)
 0.38 J
Magnetic elements are delicate – a collision with steel can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can destroy the magnet or injury to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the magnet. Use safety goggles when working with large magnets.

Table 9: Coating parameters (durability)
MW 20x1.5 / 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: Electrical data (Pc)
MW 20x1.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 979 Mx 39.8 µWb
Pc Coefficient 0.12 Low (Flat)
Total magnetic flux emitted by the magnet pole. Key data for generator designers and motors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
MW 20x1.5 / N38

Environment Effective steel pull Effect
Air (land) 0.97 kg Standard
Water (riverbed) 1.11 kg
(+0.14 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. Wall mount (shear)

*Note: On a vertical surface, the magnet retains merely a fraction of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Heat tolerance

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.12

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
Elemental analysis
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
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: 010039-2026
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This product is a very strong cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø20x1.5 mm, guarantees optimal power. The MW 20x1.5 / N38 model boasts high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 0.97 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 9.50 N with a weight of only 3.53 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel 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 high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø20x1.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø20x1.5 mm, which, at a weight of 3.53 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 0.97 kg (force ~9.50 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, 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 20 mm. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Advantages and disadvantages of rare earth magnets.

Strengths

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • They do not lose power, even over approximately 10 years – the decrease in lifting capacity is only ~1% (based on measurements),
  • Neodymium magnets are extremely resistant to magnetic field loss caused by external field sources,
  • By covering with a smooth coating of silver, the element acquires an professional look,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures reaching 230°C and above...
  • Thanks to modularity in forming and the ability to adapt to unusual requirements,
  • Fundamental importance in modern industrial fields – they are utilized in mass storage devices, drive modules, diagnostic systems, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in small systems

Limitations

Cons of neodymium magnets and ways of using them
  • At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in producing nuts and complicated forms in magnets, we propose using a housing - magnetic mount.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is a challenge,

Lifting parameters

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

The load parameter shown refers to the maximum value, obtained under ideal test conditions, specifically:
  • with the application of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • characterized by smoothness
  • under conditions of gap-free contact (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • at temperature room level

Lifting capacity in practice – influencing factors

During everyday use, the actual lifting capacity results from several key aspects, presented from the most important:
  • Clearance – existence of any layer (rust, tape, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Load vector – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Thermal environment – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was assessed with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet and the plate reduces the load capacity.

Warnings
Electronic hazard

Very strong magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Respect the power

Handle magnets consciously. Their immense force can surprise even professionals. Plan your moves and respect their power.

Medical implants

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Metal Allergy

Medical facts indicate that nickel (the usual finish) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands or select versions in plastic housing.

Demagnetization risk

Watch the temperature. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

Material brittleness

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Phone sensors

Be aware: neodymium magnets produce a field that interferes with sensitive sensors. Keep a separation from your phone, device, and navigation systems.

This is not a toy

NdFeB magnets are not toys. Swallowing a few magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and requires urgent medical intervention.

Serious injuries

Watch your fingers. Two large magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Mechanical processing

Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Important! Need more info? Read our article: Are neodymium magnets dangerous?