Package includes: 20PCS 15ml Conical Bottom Plastic Lab Centrifuge Tubes.Material: polypropylene(PP); Capacity: 15ML..Total length: 12cm/4.72inch; Outer diameter: 1.6cm/0.63inch..DESIGN FEATURES: 1. With scale, easy to read liquid volume; 2. Threaded cap for safe storage without leakage; 3. They are clear, so you are able to see through the tubes without problems; 4. You can mark the cap or tube with information for easy identification; 5.They're made rather thick and sturdy which allows you to use them over and over..PRACTICAL & MULTI-PURPOSE: These plastic test tubes are mainly used for scientific research laboratory, hospitals, epidemic prevention station, school, also great for organizing small items in the workshop and home.