Features: Made of high quality rubber material, these O-rings are durable and has longer service life. They have good abrasion resistance, elasticity, tensile strength and elongation. There are many different sizes of O-rings in this set that can meet your different need. Total 300 pieces so you do not have to worry about running out of O-rings for quite a while. They can be widely used for sealing for valves, cars, pumps, electrical equipment, bearings, etc. Specification: Material: Rubber Color: Black Normal Operating Temperature Range: -20~100 Inner Diameter*Thickness/Quantity: 9.19*2.78mm/25pcs 9.92*2.62mm/25pcs 10.78*2.62mm/25pcs 11.91*2.62mm/25pcs 12.37*2.62mm/25pcs 13.1*2.62mm/25pcs 13.95*2.62mm/25pcs 15.08*2.62mm/25pcs 15.54*2.62mm/25pcs 15.88*2.62mm/25pcs 17.13*2.62mm/25pcs 17.88*2.62mm/25pcs Weight: 190g / 6.7oz (approx.) Package list: 1 box * O-rings 1Made of high quality rubber material, these O-rings are durable and has longer service life. 2They have good abrasion resistance, elasticity, tensile strength and elongation. 3There are many different sizes of O-rings in this set that can meet your different need. 4Total 300 pieces so you do not have to worry about running out of O-rings for quite a while. 5They can be widely used for sealing for valves, cars, pumps, electrical equipment, bearings, etc.