FDA grade silicone O ring 1,Non-toxic,Waterproof,Dustproof 2,Under high wear and pressure 3,Environmental protection FDA grade silicone O ring Description:1Made of 100% grade silicone with FDA and ROHS approval;2Non-texic and odorless,Dustproof,Waterproof,Durable;3Under wear,pressure and high temperature;4All color are available,5OEM order are welcome FDA grade silicone O ring