Pack of 500 microcentrifuge tubes with 1.5ml capacity and attached snap caps. Rainbow pack includes 125 each of red, blue, yellow and green tubes. Made from high-quality virgin polypropylene, these tubes are RNase, DNase and Pyrogen free for safer use in molecular biology and other biochemical applications. Feature 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 is 20000.