Kimax 45166-50 Glass Conical Bottom 50mL Graduated Centrifuge Tube with Screw Cap (Case of 12) A centrifuge tube is a common piece of laboratory glassware consisting of a finger-like length of glass open at the top and with a conical, tapered bottom 50ml total capacity; graduated from 0-10ml in increments of 0.5ml and from 10-50ml in increments of 1ml Tube has a screw thread finish; cap is packaged separately Durable white ceramic enamel scale, legend and marking spot on each tube Calibrated to contain