Rubber Silicone Stopper 1,FDA,ROHS Certificated. 2,OEM service. 3,Ozone resistance,aging resistance,UV resistance. Rubber Silicone Stopper1, Material:NBR,CR,HNBR,ACM,SBR ... ,EPDM,IIR,NR,EP,Silicone,Viton etc.2, Hardness ... your drawings or samples.8, OEM or ODM is welcomed. Rubber Silicone Stopper