Made from high-quality virgin polypropylene, these microcentrifuge 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 and bundled in a economical 24 pack with a 1.5ml capacity. Autoclavable tubes can be used in very low temperatures and with various organic solvents, maximum RCF 20000.