The PTI F15-8x50C composite fixed angle rotor is the perfect high speed lightweight rotor for Thermo Scientific Legend RT+ and Hereaus X1, X1R, X3 and X3R centrifuges. Durable composite graphite construction. 8x50mLcapacity, 23° angle, 24000xG. Made in the USA. Ideal for pellet cells, bacteria, subcellular fractions, and small amounts of nucleic acid and viruses in disposable conical tubes (also available from CSI) This rotor was pulled from a working lab and has seen only minor usage.