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MW 9.5x1 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010107

GTIN/EAN: 5906301811060

5.00

Diameter Ø

9.5 mm [±0,1 mm]

Height

1 mm [±0,1 mm]

Weight

0.53 g

Magnetization Direction

↑ axial

Load capacity

0.40 kg / 3.96 N

Magnetic Induction

127.68 mT / 1277 Gs

Coating

[NiCuNi] Nickel

product parameters »

0.295 ZŁ with VAT / pcs + price for transport

0.240 ZŁ net + 23% VAT / pcs

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Lifting power and shape of a neodymium magnet can be reviewed with our our magnetic calculator.

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Technical parameters - MW 9.5x1 / N38 - cylindrical magnet

Specification / characteristics - MW 9.5x1 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010107
GTIN/EAN 5906301811060
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 9.5 mm [±0,1 mm]
Height 1 mm [±0,1 mm]
Weight 0.53 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.40 kg / 3.96 N
Magnetic Induction ~ ? 127.68 mT / 1277 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 9.5x1 / 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

Technical simulation of the assembly - technical parameters

The following information constitute the result of a mathematical analysis. Values rely on models for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs distance) - interaction chart
MW 9.5x1 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1276 Gs
127.6 mT
 0.40 kg / 0.88 lbs
400.0 g / 3.9 N
 weak grip
1 mm 1129 Gs
112.9 mT
 0.31 kg / 0.69 lbs
312.8 g / 3.1 N
 weak grip
2 mm 905 Gs
90.5 mT
 0.20 kg / 0.44 lbs
201.0 g / 2.0 N
 weak grip
3 mm 683 Gs
68.3 mT
 0.11 kg / 0.25 lbs
114.5 g / 1.1 N
 weak grip
5 mm 366 Gs
36.6 mT
 0.03 kg / 0.07 lbs
32.9 g / 0.3 N
 weak grip
10 mm 92 Gs
9.2 mT
 0.00 kg / 0.00 lbs
2.1 g / 0.0 N
 weak grip
15 mm 33 Gs
3.3 mT
 0.00 kg / 0.00 lbs
0.3 g / 0.0 N
 weak grip
20 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
30 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Magnetic force decreases drastically with every mm of spacing. Keep in mind that even a microscopic distance (e.g., dirt, paint, dust) strongly weakens the grip. Magnets operate optimally during direct contact; gap weakens the power. See how flashily the load capacity fall, when the magnet does not adhere tightly to the metal substrate. When planning the mounting, avoid redundant distances.

Table 2: Sliding capacity (vertical surface)
MW 9.5x1 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.08 kg / 0.18 lbs
80.0 g / 0.8 N
1 mm Stal (~0.2) 0.06 kg / 0.14 lbs
62.0 g / 0.6 N
2 mm Stal (~0.2) 0.04 kg / 0.09 lbs
40.0 g / 0.4 N
3 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
5 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 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 table below defines the theoretical holding capacity required to cause the downward movement of the magnet downwards on a vertical metal surface (considering standard friction coefficient). This value depends on the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 9.5x1 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.12 kg / 0.26 lbs
120.0 g / 1.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.08 kg / 0.18 lbs
80.0 g / 0.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.04 kg / 0.09 lbs
40.0 g / 0.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.20 kg / 0.44 lbs
200.0 g / 2.0 N
When placing a element on a upright plane (e.g., a board), it will only hold barely approx. 20%-30% of nominal attraction strength. Gravity and a weak degree of grip cause that magnets move down faster than they detach. Want to create a vertical fastening? Remember that the shear force is significantly lower than the maximum static pull force. On a painted metal, the magnet will slip down under a significantly smaller load. Using a rubber pad can drastically improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 9.5x1 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.04 kg / 0.09 lbs
40.0 g / 0.4 N
1 mm
25%
 0.10 kg / 0.22 lbs
100.0 g / 1.0 N
2 mm
50%
 0.20 kg / 0.44 lbs
200.0 g / 2.0 N
3 mm
75%
 0.30 kg / 0.66 lbs
300.0 g / 2.9 N
5 mm
100%
 0.40 kg / 0.88 lbs
400.0 g / 3.9 N
10 mm
100%
 0.40 kg / 0.88 lbs
400.0 g / 3.9 N
11 mm
100%
 0.40 kg / 0.88 lbs
400.0 g / 3.9 N
12 mm
100%
 0.40 kg / 0.88 lbs
400.0 g / 3.9 N
A thin sheet cannot absorb the full magnetic flux, which weakens actual performance of the magnet. Should you mount a strong magnet to a weak sheet, the field will penetrate right through and the pull force will drop sharply. To achieve 100% of this magnet's potential, you require a sufficiently solid backing of steel. The saturation effect means that on delicate walls (e.g., car bodies), the product holds weaker. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal resistance (stability) - power drop
MW 9.5x1 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.40 kg / 0.88 lbs
400.0 g / 3.9 N
 OK
40 °C -2.2% 0.39 kg / 0.86 lbs
391.2 g / 3.8 N
 OK
60 °C -4.4% 0.38 kg / 0.84 lbs
382.4 g / 3.8 N
80 °C -6.6% 0.37 kg / 0.82 lbs
373.6 g / 3.7 N
100 °C -28.8% 0.28 kg / 0.63 lbs
284.8 g / 2.8 N
Ordinary NdFeB products change their properties strength above the temperature limit. Protect against heat – excessive heat can permanently destroy this magnet. With every degree above norm, the neodymium's power briefly lowers. Do not use this magnet near heat sources higher than its safe range. Ignoring the limit will cause permanent loss of magnetic properties.
*Important note: Thermal stability is determined by both grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than taller cylinders. Red status in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 9.5x1 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 0.71 kg / 1.57 lbs
2 403 Gs
0.11 kg / 0.24 lbs
107 g / 1.0 N
 N/A
1 mm 0.65 kg / 1.43 lbs
2 436 Gs
0.10 kg / 0.21 lbs
97 g / 1.0 N
 0.58 kg / 1.29 lbs
~0 Gs
2 mm 0.56 kg / 1.23 lbs
2 257 Gs
0.08 kg / 0.18 lbs
84 g / 0.8 N
 0.50 kg / 1.10 lbs
~0 Gs
3 mm 0.46 kg / 1.00 lbs
2 041 Gs
0.07 kg / 0.15 lbs
68 g / 0.7 N
 0.41 kg / 0.90 lbs
~0 Gs
5 mm 0.27 kg / 0.60 lbs
1 580 Gs
0.04 kg / 0.09 lbs
41 g / 0.4 N
 0.25 kg / 0.54 lbs
~0 Gs
10 mm 0.06 kg / 0.13 lbs
732 Gs
0.01 kg / 0.02 lbs
9 g / 0.1 N
 0.05 kg / 0.12 lbs
~0 Gs
20 mm 0.00 kg / 0.01 lbs
183 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
16 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
10 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
6 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
4 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
3 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
2 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and sheet combination. The setup of magnet-to-magnet creates a more powerful interaction and a larger range of action. Designing a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Be careful that when connecting a pair of magnets, the pinch force is huge. The levitation is a bit weaker than the connection force, but still large.
*Field value for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Note: Results demonstrate friction force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - precautionary measures
MW 9.5x1 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.0 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Mechanical watch 20 Gs (2.0 mT) 2.0 cm
Phone / Smartphone 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
Extremely neodym field is a large risk to IT equipment as well as medical implants. These neodymiums generate a flux that disrupts operation of digital equipment. Remember: the invisible magnetic field acts through matter and plastic. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MW 9.5x1 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.80 km/h
(7.72 m/s)
 0.02 J
30 mm 47.99 km/h
(13.33 m/s)
 0.05 J
50 mm 61.95 km/h
(17.21 m/s)
 0.08 J
100 mm 87.61 km/h
(24.34 m/s)
 0.16 J
NdFeB products are prone to chipping – a violent impact against metal can result in shattering. Control the attraction moment – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or painful pinches to skin. Be sure to control the product during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (durability)
MW 9.5x1 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MW 9.5x1 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 184 Mx 11.8 µWb
Pc Coefficient 0.16 Low (Flat)
Flux value emitted by the pole surface. Essential parameter when building generators as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
MW 9.5x1 / N38

Environment Effective steel pull Effect
Air (land) 0.40 kg Standard
Water (riverbed) 0.46 kg
(+0.06 kg buoyancy gain)
+14.5%
Corrosion warning: 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Warning: On a vertical surface, the magnet holds only ~20% of its max power.

2. Steel saturation

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

3. Heat tolerance

*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) = 0.16

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: 010107-2026
Measurement Calculator
Force (pull)
Field Strength
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The offered product is an incredibly powerful cylinder magnet, composed of advanced NdFeB material, which, with dimensions of Ø9.5x1 mm, guarantees the highest energy density. The MW 9.5x1 / N38 model features high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 0.40 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 3.96 N with a weight of only 0.53 g, this rod is indispensable in miniature devices and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure stability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø9.5x1), 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 9.5 mm and height 1 mm. The key parameter here is the holding force amounting to approximately 0.40 kg (force ~3.96 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 9.5 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.

Pros and cons of neodymium magnets.

Advantages

Apart from their superior power, neodymium magnets have these key benefits:
  • They have stable power, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • Magnets very well defend themselves against demagnetization caused by external fields,
  • A magnet with a smooth nickel surface is more attractive,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • In view of the option of flexible molding and customization to specialized needs, NdFeB magnets can be produced in a broad palette of geometric configurations, which increases their versatility,
  • Versatile presence in electronics industry – they serve a role in mass storage devices, motor assemblies, medical devices, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in miniature devices

Disadvantages

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in realizing threads and complicated shapes in magnets, we propose using casing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
  • Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

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

The load parameter shown refers to the maximum value, recorded under laboratory conditions, meaning:
  • with the use of a yoke made of special test steel, ensuring maximum field concentration
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • under conditions of no distance (metal-to-metal)
  • for force acting at a right angle (in the magnet axis)
  • at standard ambient temperature

Determinants of lifting force in real conditions

Effective lifting capacity impacted by working environment parameters, mainly (from priority):
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is reached only during perpendicular pulling. The shear force of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
  • Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

H&S for magnets
Keep away from computers

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

Crushing force

Big blocks can break fingers in a fraction of a second. Under no circumstances place your hand between two strong magnets.

GPS and phone interference

GPS units and mobile phones are highly sensitive to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Permanent damage

Standard neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Warning for heart patients

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.

Avoid contact if allergic

A percentage of the population have a sensitization to Ni, which is the common plating for neodymium magnets. Extended handling might lead to a rash. We suggest wear protective gloves.

Magnet fragility

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Handling guide

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

Dust is flammable

Fire hazard: Neodymium dust is explosive. Do not process magnets without safety gear as this may cause fire.

Swallowing risk

Absolutely store magnets away from children. Ingestion danger is high, and the effects of magnets connecting inside the body are life-threatening.

Caution! More info about risks in the article: Magnet Safety Guide.