... grade silicone rubber bottle stopper 1.Rubber Stopper Set 2.Easy for use and varid 3.Good quality 4.OEM Colorful food grade silicone rubber ... bottle stopper Feature:1)We have kinds of material : NBR,HNBR,EPDM,SILICONE ... ,VITON,NR,FLS,FFPM,PU,PTFE etc.2)High temperature and acid-alkali ...