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These tubes are also called Screw Cap micro centrifuge tubes, cryogenic microtubes or just microtubes and are ideal for any sample processing application. Excellent for vapor phase cryo storage or when working with hazardous or valuable materials. O-rings are made from silicone to ensure a leakproof seal. Our micro tubes serve a broad range of laboratory needs, including collection, processing, centrifugation, long term storage, and OEM packaging/shipping of restricted enzymes or other DNA/RNA modifying reagents, boiling, etc.