Package Included: 36 plastic bottles, measuring approximately 20.5 mm diameter, 59.5 mm height, inner diameter: 14.5 mm, capacity: 5 ml (0.17 fl oz). Sufficient quantity for various needs. High quality: The 5 ml centrifuge tubes are made of plastic, resistant to high and low temperatures, and suitable for long-term freezing. Designed with good airtightness to help prevent leakage or evaporation, ensuring safe use. Easy to use: Each graduated plastic centrifuge tube features a screw cap. Simply unscrew the cap, fill the tube, and securely tighten the cap to help prevent leaks. Storage Box: These tubes come with a plastic storage box for convenient organization, helping keep your workspace clean and orderly. Wide range of applications: These sample tubes are suitable for holding liquids, solids, powders, seeds, pills, essential oils, perfumes, dyes, granular materials, and more. Ideal for use in hospitals, research laboratories, and other professional settings. Material: Plastic. Color: As shown. Package Contents: 36 x freezing tubes, 1 x plastic storage box. The package includes only the items listed above; other items are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.