McKesson Microcentrifuge Tube Plain 1.5 mL Snap Cap Polypropylene Tube (1169386_BG) 500/BGLarge, black, clearly printed graduations in precise increments of 0. 1 mL Frosted writing area on each tube for labeling Compatible for use with all standard and high capacity centrifuge rotors 1. 5 mL polypropylene tubes can be centrifuged at up to 20,000 RCF. Quality, food grade construction certified to be free from DNase, RNase, pyrogen, and DNA Supplied in resealable, tamper evident, self standing bags