High-quality materials: These test tubes are made of high-quality PET plastic, which is non-toxic, environmentally friendly, and resistant to breakage. The hard shell ensures durability and is easy to clean. Good sealing performance: The test tube features a screw cap that allows for easy opening and closing, providing excellent leak-proof performance to help prevent liquid leakage and keep contents sterile and moisture-proof. Washable and reusable: The tube can be washed for repeated use, making it convenient for various applications. Wide range of uses: These test tubes are suitable for holding beauty liquids such as cosmetic samples, lotions, liquids, gels, and more, and are convenient for travel. They can also store small items like beads, candies, needles, samples, and small stones. Ideal for collecting, gifting, crafting, and other creative purposes.