Package Included: You will get 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 your needs. High Quality: The 5 ml centrifuge tubes are made of durable plastic, resistant to high and low temperatures, and suitable for long-term freezing. They offer good airtightness, preventing leakage and evaporation, ensuring safe usage. 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 prevent leaks. Storage Box: These test tubes come with a plastic storage box for easy organization, helping maintain a clean and orderly workspace. 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 Note: Light reflection and differences in display screens may cause slight variations in color compared to the actual item. Measurement error is +/- 1-3 cm.