Biopur® grade Eppendorf® Safe-Lock microcentrifuge tubes are sterile and free of pyrogens, RNase, DNA and ATP. The patented Safe-Lock hinged lid that eliminates any danger from leaks or from opening accidentally. Can be autoclaved at 121°C for 20 minutes when open. Has volume graduations and etched marking surfaces. Available in 0.5, 1.5, and 2.0 mL volumes.