There rubber stoppers and aluminum plastic caps are suitable for oral liquid bottles, original solution bottles, essential oil bottles, freeze dried bottles, etc. These port rubber stopper may be used in the kitchen, laboratory, ect.Specification:Material: Aluminum, Plastic, Butyl RubberSuitable for: 13mm Glass VialPackage list: 100pcs 13mm Caps, 100pcs 13mm rubber stoppersAdvantage:The cover is smooth and burr-free after opening, and the cotton will not get caught . Made of rubber , it is durable, washable and reusable. It forms a good seal and is suitable for long-term storage of liquids or solids. Instruction :The seal can withstand high temperatures. This cover is fully tear-off, and when you tear off its plastic cover, the aluminum cover becomes unusable.
