McKesson Centrifuge Tube Plain 15 mL Screw Cap Polypropylene Tube (1082079_CS) 500/CS15 mL centrifuge tube 17 x 120 millimeters High quality, translucent tubes are molded from polypropylene material and have a conical bottom. RCF rating: 8,078xG Black printed graduations in 0. 5 mL increments for easy measurements Large, white printed writing space for convenient labeling Sterile tubes are autoclavable (without cap) for continued use. Blue screw caps are made of high density polyethylene (HDPE) are flat top and leak resistant. Racked