20000g Max RCF Marked Directly on Tube FreezeTechtemperature Indicator Changes Color at 0C Hi-VizGraduations Including Maximum Freeze Line Eco-Plastic Racks and/or Resealable Zip Bags E-Beam Sterilized (SAL 10-6) 500/Case The new ProSeriesCentrifuge Tubes offer maximum performance and a wide range of innovative features ProSeriesTubes feature a 20000g RCF rating an industry-first temperature indicator patch and Hi-VizGraduations that are recognizable at any viewing angle Marked at both their maximum nominal capacity as well as their maximum freeze volume these tubes have been designed with a focus on environmentalism and waste reduction Tubes are marked with standardized recycling information and are available in Eco-Plastic fold-flat racks rather than traditional styrofoam racks The flat markable screw caps feature high precision threads that make them easy to open with one hand without compromising the 95kPa rated leak-proof seal