... logo ok 3.Chemical resistance 4.Size as customers' request Silicone ring can be, EPDM, natural rubber and other materials produced, the ... to remove and useful2.Material:made of 100% food grade silicone(FDA,SGS..)3.Different specifications and shapes available4.Customers design ... , Red, Blue and so on)and material are optional. 10.Silicone,Viton,Neoprene,Hypalon, plastic products PC,nylon,ABS,HNBR,EPDM ...