Axygen® Microcentrifuge Tubes manufactured by Corning are pre-assembled with a screw cap with O-Rings which provides a tight secure seal. Screw cap tubes are available in a variety of colors with a conical or self-standing bottom. Sterile options are also available.
Colored-cap versions are also available in sterile format Free of RNase and DNase Nonpyrogenic
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Axygen 1.5mL Self Standing Screw Cap Microcentrifuge Tube And Cap, With O-rings, Polypropylene, Clear Cap, Nonsterile, Corning Inc. (CAT#: STEM-LC-0819-LC)