... Dustproof Silicone O Rings:1,Performance: FDA grade, oil resistance, friction resistance, anti-aging and ozone, high and low temperature ... etc 2,Toolings: more than 2 thousand toolings of o-rings, washers and gaskets 3,Color: free choice(black, white, green, ... widely applied in faucets, toilets, fittings, pipes, showers and other industry accessories, and auto parts for sealing. 7, Materials: NBR; ...