This package contains 100pcs plastic test tubes of 13*78mm with cork caps. These test tubes are made of high-quality plastic and are durable and reusable. The cork cap ensures a secure seal and prevents leakage. The U-shaped bottom design allows you to use the tube and makes pouring liquids easier. These plastic test tubes are the perfect replacement for glass test tubes and offer a safer and more convenient option. They are ideal for school laboratory experiments and scientific research.