... Shape: Accordint to your blueprint OEM silicone rubber gasket for bottle stopper: 1, Material:NBR,CR,HNBR,ACM, SBR,EPDM,IIR ... ~90 shore A3, Property: high/low temperature resistance,oil and fuel resistance,weathering resistance,Ozone resistance etc.4, Certification:ISO9001:2008 ... , OEM or ODM is welcomed. OEM silicone rubber gasket for bottle stopper