silicone O ring 1.any size for silicon O ring 2.Non-toxic,Waterproof,Dustproof 3Under high wear and pressure 4.OME welcom silicone O ring Features:1) AS-568, PG standard and non-standard Silicone O-rings 2) Various colors available, such as black, green, yellow, blue, red 2) RoHS ,SGS,FDA,LFGB directive compliant green products3) Available materials: silicone, fluoro silicone, viton(FKM), ...