5 ml polypropylene tube will withstand autoclaving (120°C for 15 minutes at 15 psi), boiling and freezing to -90°C. It will fit many centrifuges that accommodate a 15 ml tube and can be centrifuged up to 5,000 x g. There is a frosted marking area on the cap for sample tagging and identification. Note: new packaging has 200 tubes/bag.