Specification Brand : uxcell BulletPoint1 : Product Name : O Ring;Material : Silicone BulletPoint2 : Outside Diameter : 13mm / 0.5";Inner Diameter : 9mm / 0.35" BulletPoint3 : Thickness : 2mm/ 0.08";Color : Black BulletPoint4 : Weight : 8g BulletPoint5 : Package Content : 50 x O Ring Color : Black ExteriorFinish : Rubber ExternallyAssignedProductIdentifier1 : 756995051731 ExternallyAssignedProductIdentifier2 : 0756995051731 ItemName : uxcell 50 Pcs Black Silicone O Ring Seal Washers 13mm x 9mm x 2mm ItemPackageDimensions_Height : 11.5 centimeters ItemPackageDimensions_Length : 1.7 centimeters ItemPackageDimensions_Width : 10 centimeters ItemPackageQuantity : 1 ItemShape : Round ItemTypeKeyword : o-ring-seals Manufacturer : uxcell Material : Silicone ModelNumber : a12070600ux0613 NumberOfItems : 5 NumberOfPieces : 12 PackageLevel : unit PartNumber : a12070600ux0613 ProductDescription : Features high temperature industrial duty black silicone tube dampeners. It fits for vacuum tube to stop noise and rattle of the tube. Made of silicon and not get hot and burn up. These are used in shocks, absorbing vibration, and many other uses.