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 various uses. High Quality: The 5 ml centrifuge tubes are made of durable plastic, resistant to high and low temperatures, and suitable for long-term freezing. Designed with good airtightness to help prevent leakage or evaporation, providing reliable performance. 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 avoid leaks. Storage Box: These tubes come with a plastic storage box for convenient organization, helping keep your workspace neat and samples well maintained. Wide Range of Applications: These small sample tubes are suitable for holding liquids, solids, powders, seeds, pills, essential oils, perfumes, dyes, granular items, and more. Ideal for use in laboratories, hospitals, and research facilities. 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 between the image and the actual item. Measurement error is +/- 1-3 cm.