Package: 30pcs 25ml clear flat glass test tubes with cork stoppers. Size: 0.79 inches 3.9 inches / 20 100mm, Volume: 25ml.Outside Diameter: 0.79in / 20mm; Inner Diameter: 0.71in / 17-18mm; Wall Thickness0.04in / 1.1mm) Material: The glass test tubes are made of heat-resistant borosilicate glass. Features: The transparent test tubes with caps have good sealing performance, can be reused, solid, non-toxic and light weight. Use: They can be used to store liquid, bath salts, powder, candy, sample, beads. Transparent test tubes are suitable for various scientific experiments, planting plants, holiday party and home decoration. ",When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don't hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it