stopper: 1.silicone meterial 2.used for glass vial seal size:13&20mm type: siliconeWe can supply the stopper with silicone meterial or rubber meterial.we have exported to many countries, as USA, Chile, Brazil,German, Spain, France, Poland, Ecuador, Hungary, Australia, Japan, Korea, Singapo, Malaysia, Thailand, Sysia, Pakistan, Jordan etc.So if you have any question please kindly contact us, ...