Material: These mini vials are made of borosilicate glass. Cap color: black. Glass bottle is easy to clean and can be refilled and used Portable Size: 18 mm x 42 mm (L x W). Portable size, easy to carry everywhere Leak-proof design: The vial is tightly sealed, not easy to leak. The foam seal paper inside the cap can effectively seal the bottle even when you don’t insert a reducer plug in Wide range of use: These glass bottles suitable for smaller applications such as loading various oil; compound essential oils; facial serum; eye serum; perfume oils; sample display, etc Package includes: 10 pack 5 ml glass bottles, to meet various needs