Description:Made of rubber material,heat-resisting,wear-resisting,better shock absorption.Rubber construction resists oil,gas,water and alcohol solvents,durable.Widely used on automotive components.Flexible seal is easy to install for you.Specification:Material: RubberColor: PurplePacakge Included:270(+/-2%) x O-Ring Seal Gasket20pcs 7/32"×1/16"or (5.29×1.78mm)20pcs 1/4"×1/16"or (6.07×1.78mm)20pcs 6.8×1.9mm20pcs 5/16"×1/16"or (7.65×1.78mm)20pcs 7.8×1.9mm20pcs 8×2mm20pcs 8.8×1.9mm15pcs 7/16"×1/16"or (10.82×1.78mm)15pcs 7/16"×3/32"or (10.77×2.62mm)15pcs 11×2mm15pcs 12×2mm10pcs 13.9×1.8mm10pcs 9/16"×3/32"or (13.95×2.62mm)10pcs 14×2mm10pcs 15×2mm10pcs 17×2mm10pcs 11/16"×1/16"or (17.17×1.78mm)10pcs 11/16"×1/8"or (17.04×3.53mm).