PREMIUM MATERIAL - Our 15ml conical tubes are made of high purity pp material it can be sterilized, the surface is smooth. Durable and lightweight, easy to carry. PERFECT DESIGN - Our sterile test tubes with screw caps to prevent leakage. Plastic centrifuge tubes with graduated marks, to meet your various experimental needs. WIDE APPLICATION - Our plastic centrifuge tubes are general used in fields of biochemistry and molecular biology, such as separation and preparation of various biological samples. CONVENIENT AND PRACTICAL - Our centrifuge tubes with a large unerasable frosting white printed writing area provide easy and legible mark, and both the graduations and writing areas are chloroform-resistant. WORRY-FREE SHOPPING - Please do not hesitate to contact us if any issues with our sterile test tubes, you can get 30 days of worry-free refund, 7 days of 24-hour service after receiving it. Just remember that your satisfaction is our first priority. About Us is an experienced seller of 15ml centrifuge tubes, and we aim to provide high-quality products with fantastic stability, and perfect appearance to our consumers. Features : Plastic centrifuge tubes include a convenient white writing patch for easy marking and identification. The patches are nice for labeling. Centrifuge tubes have a capacity of 15ml, have an outer diameter of 16mm, a length of 120mm, a blue bottle cap, and a tapered bottom. It is not only ideal for scientific experiments and storing beads, spices, liquids, seeds, and more, but also can be used for mixing drinks to decorate Christmas, and theme parties perfectly. The sterile test tubes with screw caps can be closely screwed to the centrifuge tube which has great performance of sealing and prevent liquid leaking effectively. Centrifuge tubes have snap-on caps that are not easy to leak and have a clear scale to help accurate sampling Specifications : Material: Polypropylene (PP) Color: Transparent Size: Outer diameter: 16mm Length: 120mm Package Includes : 200 x 15ml Centrifuge tubes Notes : Because of manual measurement, please allow an error of 1-2%. Thoughtful Service : Any questions, please feel free to contact us on Amazon, we will answer and solve for you within 24 hours. Happy shopping!