... 1.Silicone FKM FPM VITON A VITON B GF GFLT GLT AFLAS HNBR... 2.High price performance ratio 3.OEM&ODM ... ring MaterialSilicone,,FKM,FPM,VITON A, VITON B, GF,GFLT,GLT,AFLAS,HNBR... ColorRed, blue, pink,white, black, any color is ... ring HNBR FKM FPM VITON A VITON B GF GFLT GLT AFLAS