... .any size for silicon O ring 2.Non-toxic,Waterproof,Dustproof 3Under high wear and pressure ... 4.OME welcom silicon O ring Features:1) AS-568, PG standard and non-standard Silicone ... , IR, IIR(butyl rubber), CR (neoprene), EPDM, SBR, AU, ACM, CO; wide range of materials are available 4) Excellent chemical and ...