... 3,Material: silicone 4,OEM & ODM warmly welcomed Silicone Sealing Ring:1,Performance: FDA grade, oil resistance, friction resistance, anti-aging ... , fittings, pipes, showers and other industry accessories, and auto parts for sealing. 7, Materials: NBR; FKM; Silicone; Viton; EPDM; SBR; NR ... are available upon request(OEM & ODM products warmly welcomed) rubber ring