Our centrifuge tubes are sterilized, manufactured from high-clarity polypropylene. Graduations are printed in a bold easy-to-read and are accurate to ±2%. Large white marking area provides excellent contrast for identification. The extended cap design facilitates one hand removal of caps and helps prevent contamination. Conical bottom tubes have smooth, flat surface polyethylene caps. Maximum rotate speed up to 12 000 x g for 15 ml conical bottom centrifuge tubes, 9 500 x g for 50 ml centrifuge tubes. Autoclavable at 121°C and freezable to -80°C.