silicone O ring 1.any size for silicon O ring 2.Non-toxic,Waterproof,Dustproof 3Under ... OME welcom silicon O ring Features:1) AS-568, PG standard and non-standard Silicone O-rings 2) Various ... ,SGS,FDA,LFGB directive compliant green products3) Available materials: silicone, fluoro silicone, viton(FKM), neoprene, HNBR, NBR+PVC, NBR, ... ) Customers' designs and specifications are accepted silicone O ring