... and colors, such as O-ring, U-ring, E-ring etc, its material spec can be silicone rubber,butyl nitrile rubber,nature rubber, EPDM rubber etc, their performance ... and mold/tooling workshop under group) MaterialSilicone or rubber (NR, SBR, NBR, EPDM, CSM, CR, HNBR, VITON, AFLAS) and more , which are ... 20 to 30 daysMOQSmall orders are wecomed Standard size black rubber O-ring