Uniform glass distribution in the wall, taper and bottom of these 50mL PYREX® conical centrifuge tubes provides improved mechanical strength, prevents the formation of failure-causing stress regions during centrifuging and insures the highest degree of accuracy. The durable, white enamel scale is graduated from 0 to 10mL in 0.5mL divisions, and from 10mL to 50mL in 1mL divisions. Tubes have pourout spout for easy decanting.