Leak-proof seal design Maximum centrifugal force to 10000g, No DNAse, RNAse and Pyrogens free Tube covered leak-proof seal design, Single-hand operation switch. Clear and transparent wall, easy to observe, fits most brands centrifuge rotors Blue graduations printed to max volume Large white writing area for easy sample identification Maximum centrifugal force to 8000g No DNAse, RNAse and Pyrogens ...