Product name: 5ml glass vials. Material: These mini vials are made of borosilicate glass Wide range of use: Ideal for essential oils, perfume oils, or other liquids sample display Easy to use: Glass bottle is easy to clean and can be refilled and used. Refillable so you can use over and over again 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 Dimension: 18mm x 43mm. Portable size, easy to carry everywhere