Glass-like clarity allows easy viewing of sample and pellets. Ideal for highspeed centrifugation, proprietary homopolymer polypropylene tubes are rated up to 24,000 x g. Trust SafeSeal microcentrifuge tubes with your most valuable samples. A positive seal design allows repeated cap closures that will not pop during boiling. All tubes feature external graduation marks and frosted writing surfaces. Available in natural and rainbow pack colors. Side gated tubes offer a clearer pellet view and increased strength over traditional style tubes. Superior clarity RCF rating of 24,000 x g Temperature rating from -80C to +121C Fit all standard rotors Autoclavable WILL NOT POP OPEN DURING BOILING OR FREEZING Natural Polypropylene Grad Lines: Yes Non-Sterile 1,000 Tubes/Bag, 10 Bags/Case Certified RNase/DNase Free Certified Human DNA Free Certified PCR Inhibitor Free Certified Pyrogen Free