CellPro™ screw-cap microtubes come sterile, in a variety of sizes, cap configurations, graduation options, and even a loop-cap option for the 2.0mL version. Made from ultra-clear polypropylene, these screw-cap microtubes include assembled caps with silicone O-rings that assure a leakproof seal from -86°C to +121°C. All CellPro™ screw cap microtubes are sterile, RNase, DNase, & pyrogen free and may be centrifuged at up to 22,000×g*. By popular demand for researchers, as well as diagnostic / reagent packaging applications, CellPro’s O-ring screw caps are now available in single color packs of 1000. Order now in blue, green, orange, red, yellow, or natural color. *Refers to liquids with a specific gravity of 1.0, using appropriate rotors, cushions, and adapters. • Leak-proof O-ring seal• Ultra-clear polypropylene• Packaged in resealable bags of 50• Sterile; RNase, DNase & Pyrogen free • Available with white, printed graduations