Locking lid snap cap tubes offer the extra sample security found with screw cap tubes, yet have the same ease of use as snap cap tubes. Autoclavable, boil proof, and freezable to -80 °C. Made from 100% virgin polypropylene. Locking Lid snap cap tubes are easy to open and close and offer the most convenient choice for routine laboratory procedures such as sample storage, centrifugation, and preparation. Sterile product free of Rnase, Dnase, DNA and Pyrogen, Endotoxin, Bioburden and ATP.