SpectraTube™ 15mL Centrifuge Tubes (flat rainbow screw cap, bulk bags), Cat. No.: MTC-C2716, Color coded caps for easy sample identification, 15mL rated to 12,000xg, 50mL rated to 15,000xg, Sterile, RNase, DNase, pyrogen and cytotoxin free, Sterile (gamma) and individually packed, Leak Proof