... than 2 thousand toolings of o-rings, washers and gaskets3,Color: free choice(black, white, green, red, brown, yellow, ... : 20~50degree centigrade;NBR(-40~120C),ACM(-30~180C),VITON(-25~300C)ColorRed, Black, White, Clear, etcSPECIALFeaturesOil-resistant; heat resistant ... . Size tolerance: exactly upon your request or standard tolerance.5. Color: black, transparent, green, red, grey, purple, etc. or ...