DescriptionApplication - Our Silicone Stopper can be used in the laboratory and at home, with a good sealing effect and convenient storage. Suitable for oral liquid bottles, original solution bottles, essential oil bottles, freeze-dried bottles, etc. Suitable for oral liquid bottles, original solution bottles, essential oil bottles, freeze-dried bottles, etc.Material - Made of Silicone it has good oil resistance and acid and alkali resistance and can maintain stable performance in high temperatures. it is washable and reusable. It forms a good seal and is suitable for long-term storage of liquids or solids.How to Use - These rubber caps can be punched with injection holes so that culture media can be injected with an injection needle without removing the rubber stopper. It is more clean and easier to use.Rubber Bottle Caps - These self-healing stoppers are worth it if you want to seal things, rubber drain stoppers feature an inert coating on the surface that helps better seal the bottle, allowing the contents to be stabilized.Specification:Material: SiliconeSuitable for: 12 mm/0.5 inch Glass VialInside diameter: 12 mm/0.5 inchOuter diameter: 19 mm/2.4 inchesHeight: 7 mm/0.3 inchesPackage Content: 200 x Rubber Stoppers