Greiner Bio-One 227285 CELLSTAR Polypropylene Centrifuge Tube with White Screw Cap, 50 mL Capacity, 30 mm Dia. x 115 mm L, Sterile, Conical, V Bottom, 20 Bags of 25 (Pack of 500): Amazon.com: Industrial & Scientific
50 mL Amber Conical Screw Cap Tubes, Greiner Bio-One - USA Scientific, Inc
Greiner Bio-One 227261 CELLSTAR Polypropylene Centrifuge Tube with Blue Screw Cap, 50 mL Capacity, 30 mm Dia. x 115 mm L, Sterile, Conical, V Bottom, 20 Racks of 25 (Pack of 500): Amazon.com: Industrial & Scientific