... 3,Material: silicone 4,OEM & ODM warmly welcomed Silicone Sealing Ring:1,Performance: FDA grade, oil resistance, friction resistance, anti-aging ... of o-rings, washers and gaskets 3,Color: free choice(black, white, green, red, brown, yellow, purple, pink, translucent, clear etc ... are available upon request(OEM & ODM products warmly welcomed) rubber ring