This convenient assortment includes 125 each of red, blue, yellow and green tubes.Made from high-quality virgin polypropylene, these Micro Centrifuge Tubes are RNase, DNase and Pyrogen free for safer use in molecular biology and other biochemical applications. Include a connected snap cap, large molded-in graduations, and a frosted surface for easier writing. Autoclavable tubes can be used in very low temperatures and with various organic solvents. Maximum RCF 20000.