Premium centrifuge tubes are made of premium materials that meet USPU Class VI resin standards, and are FDA CFR 21 compliant for food safety. DNase free, RNase free, Human DNA free, and free of Pyrogens and Endotoxins. Tubes are manufactured in a class 100,000 clean room and gamma irradiated to SAL 10-6. These centrifuge tubes have high spin rates with maximum RCF ratings of up to 20,000 x g.