Novas Bio Screw Cap Tubes are used in a wide range of laboratory applications. These include collection, processing, centrifugation, long-term storage and transportation of valuable biological materials. These Tubes are available with clear Caps in addition to 5 different colors: Green, White, Blue, Yellow, Red. The Tubes can withstand high-speed centrifugation up to 20,000 x g and can be used in extreme temperature environments ranging from -195°C (LN2 vapor phase) to +121°C. The Tube design incorporates ribs which facilitate single-handed operation, even with gloves. The Caps have a syringe port providing easy sample access.