Our glass test tubes are designed with a round bottom for enhanced stability, reducing the risk of tipping over during use. The 20ml capacity is suitable for a wide range of applications, from chemical and biological experiments to plant propagation. The set includes multiple tubes, providing ample supply for your laboratory needs. Features -Color:Transparent -Material:Glass, cork -Size:15.50X2.00X2.00cm/6.09X0.79X0.79in Volume: 20ml -These laboratory sample vials are made of cork and glass, ensuring exceptional clarity and the ability to withstand sudden temperature changes. -The design features a round bottom, which provides stability on flat surfaces and reduces the risk of accidental spills. -Each vial has a capacity of 20ml, making it suitable for accurate measurements and secure sample storage. -The test lab tube set includes cork stoppers that fit snugly, keeping the contents safe from external debris and ensuring a tight seal. -These versatile vials are suitable for various uses, including scientific experiments, plant propagation, and decorative purposes. Package list: 20 tubes