... Shape: Accordint to your blueprint OEM silicone rubber gasket for bottle stopper: 1, Material:NBR,CR,HNBR,ACM, SBR,EPDM,IIR,NR ... ,FKM etc.2, Hardness:Between 30~90 shore A3, Property: high/low temperature resistance,oil and fuel resistance,weathering resistance,Ozone ... , OEM or ODM is welcomed. OEM silicone rubber gasket for bottle stopper