TUBE, CENTRIFUGE 15ML CLR BLK (500/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 Autoclavable tubes for continued use (without cap) Included blue screw caps are made of high density polyethylene (HDPE), flat-top and leak-resistant Not Made with Natural Rubber Latex Packaged: 500 Per Case