... o ringSizeCustomized/standard and nonstandardBrand Nameo ringMaterialNBR,HNBR,EPDM,SILICONE,VITON,FLS,FFPM,PTFETemperatureCommon: 20~50degree centigrade;NBR(-40 ... (-25~300C)CertificateCE, ROHS, PAHS, REACHColorRed, Black, White, Clear, etcSPECIALFeaturesOil-resistant; heat resistant; abrasion-resistant;aging resistant; insulation; ... your reference.We're hoping your inquiry Molded silicone flat gasket