Package Include--here come with 50pcs glass headspace vials, with aluminum flip off caps and rubber stoppers; Size about 38mm high, 22mm in diameter, capacity 5ml. Premium Quality--Made of clear glass, corrosion resistant, the material properties will not change in contact with most chemicals, better than plastic bottle. Transparent Bottle--The clear glass bottles allows you to identify the contents and looks great with any label, perfect for travel. Easy to Store--The glass vials with aluminum flip off caps and rubber stoppers, designed for easy and comfortable opening and closing, sealed cover protects from leakage, don't be worry the contents will be spilling out. Wide Application--The sample bottle allows you to store essential oils, mixes, or other samples meet your daily needs. And the packaging makes it perfect for traveling and it easily fits in your purse.