'o' ring are torus or doughtnut shapes rings defines by their inner diameter (id) & cross section (cs) we provide quality 'o' ring from small as 0.80mm (id) to 1500mm(od) without joint.construction material : nitrile(nbr)fluorocarbone(viton)silicone (vmq)flurosilicone(fvmq)plyurethaneptfe(teflon)natural rubber (nr)ethylene propylene (epdm)styrene butadiene rubber (