... ring MaterialSilicone,,FKM,FPM,VITON A, VITON B, GF,GFLT,GLT,AFLAS,HNBR... ColorRed, blue, pink,white, black, any color is availibleSizeNormal size ... ,or customized size is welcomedCertificateROHS; SGSPlace of originGuangdong, ChinaFeatures 1.High temperature resistance ...