Specification Brand : uxcell BulletPoint1 : Product Name : O Ring;Material : Silicone BulletPoint2 : Inside Diameter : 16mm/ 0.63";Outside Diameter : 21mm/ 0.83" BulletPoint3 : Thickness : 2.5mm/ 0.1";Color : Brick Red BulletPoint4 : Weight : 4g BulletPoint5 : Package Content : 10 Pcs x O Ring Color : Red ExternallyAssignedProductIdentifier1 : 608641832549 ExternallyAssignedProductIdentifier2 : 0608641832549 ItemName : uxcell 10 Pcs Silicone O Ring Seal Sealing Gasket 16mm x 21mm x 2.5mm ItemPackageDimensions_Height : 0.762 centimeters ItemPackageDimensions_Length : 10.16 centimeters ItemPackageDimensions_Width : 7.62 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : o-ring-seals Manufacturer : uxcell Material : Silicone ModelNumber : a12041800ux0221 NumberOfItems : 5 PartNumber : a12041800ux0221 ProductDescription : Flexible brick red silicone O ring seal. It is a great solution for sealing application where there are high temperatures and corrosive liquids or gases involved. Used widely for mechanical sealing, pressure, gas compressor, reaction, heat exchanger, boiler, filter, automobile, electrical appliance, and other fields.