material: O-rings are made of high-quality commercial nitrile rubber (NBR, Buna-N), with good water resistance, oil resistance, heat resistance, sealing, corrosion resistance, abrasion resistance, and antistatic properties , To meet the needs of safe and durable use. of Models: Universal O Ring buna kits, mechanic nitrile repairs, essential for all workshops and onsite service engineers. have 24 different models to meet your needs, Sizes range from 6mm to 28mm in outer diameter. Wide Applications: have heat resistance: -40C (-40F) to 120C (248F) and are strong and ductile. Therefore NBR O-rings can prevent leakage in fuel or water pipes, hydraulic and pneumatic connections, and a safe seal for any oil, air, gas and water sealing applications (faucets, sinks, ); used in electronic equipment , Pipes, faucets, pumps, solenoids, pressure gauges, sensors, autos, motorcycles, ships, engines, spray , etc. Convenient Storage and Use: 740 pieces of NBR rubber O-rings are stored in a sturdy, transparent plastic box with a label, and the required size can be easily , eliminating the of sorting and selecting the size. Abundant types and sufficient quantities can allow you to use enough time. Colour: black Material: nitrile rubber Package Contents: 50 x 6 x 1.5mm O-rings 50 x 6.5 x 1.5mm O-rings 50 x 7 x 1.5mm O-rings 50 x 8 x 1.5mm O-rings 50 x 9.0 x 1.5mm O-rings 50 x 10 x 1.5mm O-rings 50 x 11 x 1.5mm O-rings 50 x 12 x 1.5mm O-rings 50 x 13 x 1.5mm O-rings 30 x 14 x 1.5mm O-rings 30 x 15 x 1.5mm O-rings 30 x 16 x 1.5mm O-rings 20 x 17 x 2.4mm O-rings 20 x 18 x 2.4mm O-rings 20 x 19 x 2.4mm O-rings 20 x 20 x 2.4mm O-rings 20 x 21 x 2.4mm O-rings 20 x 22 x 2.4mm O-rings 20 x 23 x 2.4mm O-rings 20 x 24 x 2.4mm O-rings 10 x 25 x 3.1mm O-rings 10 x 26 x 3.1mm O-rings 10 x 27 x 3.1mm O-rings 10 x 28 x 3.1mm O-rings Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.