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2.0mL Eppendorf Biopur Safe-Lock microcentrifuge tubes provide the highest biological purity category. This is achieved by a fully automated production process under clean room conditions and the subsequent ß sterilization. The patented hinged lid on these tubes eliminates any danger of leaks. Safe-Lock style tubes ensure absolute safety when working with expensive or toxic samples, radioactive substances, or DNA. All microtubes have volume graduations and an etched marking surface. Biopur microcentrifuge tubes are sterile and free of pyrogens, RNase, DNA and ATP. These tubes are monitored and certified by an external lab. All tubes are individually sealed. Eppendorf #: 022600044.