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:Between 30~90 shore A3, Property ... drawings or samples.8, OEM or ODM is welcomed. Rubber Silicone Stopper