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These disposable screwcap microcentrifuge tubes are available sterile or non-sterile. The sterile tubes include a cap with nitrile O-ring. The non-sterile tubes and caps are sold separately so that you have a choice of cap styles (with O-ring or without).

Microtube, 0.5mL, Self-Standing, Attached Screwcap for Color Insert, O-Ring, Sterile, PP, 1000/Pack

microtube-05ml-self-standing-attached-screwcap-for-color-insert-o-ring-sterile-pp-1000-pack

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