Package: 30 Pcs 25ml clear flat glass test tubes with cork stoppers. Size: 0.79 inches x 3.9 inches / 20 x 100 mm, Volume: 25ml. Outer diameter: 0.79 inches / 20 mm; inner diameter: 0.71 inches / 17-18 mm; wall thickness 0.04 inches / 1.1 mm. Material: The transparent test tubes are made of heat-resistant borosilicate glass. Features: These transparent test tubes with lids offer excellent sealing performance, are reusable, solid, non-toxic, and lightweight. Usage: Perfect for storing liquids, bath salts, powders, candies, samples, and beads. These transparent test tubes are suitable for various scientific experiments, plant propagation, party decorations, and home decor. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours Hope you have a pleasant shopping experience!