• Graduated test tubes with 10 ml capacity and clear markings for precise reading. • Made of high-quality polypropylene (PP), durable and with good transparency. • Suitable for prolonged freezing with a thermal resistance of up to -180 °C. • Includes a screw cap that guarantees a hermetic seal to prevent leaks and sample evaporation. • Functional design with a base that allows the tube to stand on its own. • Versatile application in laboratories, hospitals, research centers, storage of essential oils, or crafts. • Easy operation that allows unscrewing the cap with one hand.