... red,green,yellow,blue or follow the color codeAdvantageGood Ozone resistance, aging resistance, high/low temperature resistance, acid/alkali ... FDAMaterial100% pure silicone o-ringMaterial usage is based on the final product condition.Packing Spec.Standard packing:a. ... High and low temperature resistance, oil resistance, anti-ozone and aging, wearing Various sizes & colors as following: high quality ...