45ML Plastic Tubes: The tubes are made of sturdy PET plastic while caps are made of high-quality aluminum. This premium plastic material has excellent practicality and durability. PET plastic also provides a non-, reusable, eco-friendly, safe and not break easily. Meanwhile clear tubes allows you to quick identify the contents. Compared with glass, it is to use. Leak-Proof: Test tube with screw cap ensures the sealing performance, which is used to effectively prevent sample leakage and it smooth, flat inner , no residual solution, its easy to clean, flexible cap, convenient operation and easy to carry. Specimen Collect: Multi-Function test tube, widely used in collecting Specimen in molecular biology, biochemistry, clinical chemistry and other fields. It's a great and value clear test tubes, work for a host of fields, like lab experiment, school, hospital, industrial applications or home use for taking certain measure liquid. Perfect Plastic Tubing: The tube container size: About 140mm. The cap seals well which was the most important thing , ideal for DIY bath salt tubes and candy tube containers.Widely used in storing liquid, powder and small objects like jewelry, candy, seed, beads, essential oil, propagate plants or chocolate bean etc. size: Diameter 28mm, height about 140mm Material: PET, aluminum cover colour: transparent Package Contents: 25 x Plastic Test Tubes with Caps Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.