... 1,Non-toxic,Waterproof,Dustproof 2,Under high wear and pressure 3,Environmental protection 4,Durable Silicone ringsDescription:1>Made ... of 100% grade silicone with FDA and ROHS approval;2>Non-texic and odorless,Dustproof,Waterproof,Durable;3>Under wear ... ,pressure and high temperature;4>All color are available,5>OEM order are welcome.6.Pure silicone material Silicone rings with best quality