... Standard size in stock. 4.Thermal aging resistance. Details of air compressor o ring: 1. Materials: comply to ROHS, Viton, ... your request. 4. Tolerance: strictly upon international standard, no flash.5. Color: black, transparent, green, red, yellow, grey, purple, ... your request. 4. Tolerance: strictly upon international standard, no flash.5. Color: black, transparent, green, red, yellow, grey, purple, ...