Leakproof: Each vial is equipped with seal gasket in screw plastic cap, sealed tight to prevent any leakage. You can put it anywhere without worrying about it leaking, easy to store and carry. Material: The vial is made of borosilicate glass which can withstand temperatures from minus 200 to 200 degrees. They can be refrigerated, heated and boiled. Durable and can be used repeatedly. Capacity: 2 ml (about 0.5 dram); Diameter: 28 mm x 15mm; Internal diameter (bottle opening): 8mm. Wide Applications: The vial is great for storing liquids, powder, seeds, specimen, and small objects etc. Air doesn't get into the vial, don't worry about deterioration. Package: 144 Bottles of 2ml glass vials with plastic caps.