1. These cryogenic storage tubes are made of certain materials and are designed for freezing. The screw caps can provide convenience for testers. For various institutions that may need to conduct different tests, these tubes are useful. 2. Features: - Color: The tube body is transparent, and the cap color is random. - Material: Plastic. - Dimensions: 6.00×2.00×2.00 cm / 2.36×0.79×0.79 inches. - Capacity: 5 ml. - These cryogenic storage tubes are made of materials suitable for freezing. - The equipped screw caps can offer convenience for testers. - The test tubes are relatively sturdy and safe, with good sealing, which can prevent the stored items from being affected by bacteria and moisture. - These multi - functional transparent plastic tubes can be used in a variety of application scenarios. - The plastic used is durable and environmentally friendly. The hard shell ensures its durability and is easy to clean. 3. Packaging List: 40 cryogenic storage tubes