Lab tube includes a convenient white writing sticker for easy labeling and recognition, making it very suitable for scientific experiments and applications. conical centrifuge tube is made of high-purity material, which is and not fragile. In order to prevent leakage, we designed a cap with a sealing ring, which is longer in length and not loose. Test tubes with lids are , pyrogen-free, DNase/RNase-free, Max.: 9, 400. It can be autoclaved at 121℃/249.8℉ or Freeze to -80℃/-176℉. Successfully passed 95 KPa pressure test. They are safe to be used in a variety of applications, including solid, liquid, powder, seeds and granular objects. Plastic test tubes is well made, perfectly sized, and has an easy to read , accurate to ± 2%, in increments of 1mL (total 15mL). Our centrifuge tubes, which is widely used in the fields of biochemistry and molecular biology, such as the separation and preparation of various biological samples, it is also suitable for handmade, such as beverage and food coloring mixing. It is a good helper for scientists, laboratory technicians, researchers, craftsmen and coffee lovers.