Thermo Scientific™ QSP microcentrifuge tube are DNA, DNAse/RNAse, andpyrogens free. Graduated tube with snap cap made it easy to open/close with one hand, and firmly closed so no sample go to waste. Available in 1.5 ml and 2.0 ml. Also available in new technology, locking lid microcentrifuge tube, offer extra security while maintaining an easy to open cap. QSP Locking Lid microcentrifuge provide a superior lock for safe and convenient centrifuge, boiling, freezing, incubation, and sample storage.