... ,Material: silicone 4,OEM & ODM warmly welcomed Dustproof Silicone O Rings:1,Performance: FDA grade, oil resistance, friction resistance, anti-aging ... etc 2,Toolings: more than 2 thousand toolings of o-rings, washers and gaskets 3,Color: free choice(black, white, green ... upon request(OEM & ODM products warmly welcomed) Dustproof Silicone O Rings