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 5ml centrifuge tube is made of durable plastic, resistant to high and low temperatures, and can be frozen for extended periods. It features good airtightness, preventing leakage or evaporation, ensuring safe use. Easy to Use: Each graduated plastic centrifuge tube has a screw cap. Simply unscrew the cap, pour in the material, and tighten the cap securely to prevent leaks. Storage Box: These test tubes come with a plastic storage box for convenient organization, helping keep your workspace clean and orderly. Wide Range of Applications: These small 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 between the image and the actual item. Measurement error allowance is +/- 1-3 cm.