TUBE, CENTRIFUGE STR RACKED BLU 15ML (50/PK 10 PK/CS) McKesson Centrifuge Tubes High-quality, translucent tubes molded from polypropylene material featuring a conical bottom 8,078xG / 8500 RCF Spin Rate 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 Screw caps made of high density polyethylene (HDPE) are flat-top and leak-resistant Racked with color-coded screw caps attached for added convenience Not Made with Natural Rubber Latex Packaged: 50 Per Rack, 10 Racks Per Case