Package Included: 36 plastic bottles, each measuring approximately 20.5 mm in diameter, 59.5 mm in height, with an inner diameter of 14.5 mm and a capacity of 5 ml (0.17 fl oz). Sufficient quantity for various uses. 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, enabling safe usage. Easy to Use: Each graduated plastic centrifuge tube features a screw cap. Simply unscrew the cap, fill the tube, then 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 neat and materials well stored. Wide Range of Applications: These small sample tubes are suitable for holding liquids, solids, powders, seeds, pills, essential oils, perfumes, dyes, granular objects, and more. Ideal for use in hospitals, research laboratories, and other professional environments. Material: Plastic Color: As shown Package Contents: 36 x Freezing Tubes 1 x Plastic Storage Box Note: The package includes only the items listed above. Other items are not included. Note: Lighting effects and differences in display screens may cause slight variations in color between the product image and the actual item. Measurement error allowance is +/- 1-3 cm.