Corning® Pyrex® graduated pourout cylinders are calibrated "to deliver" and have white enamel graduations. Bumper guards are supplied on 25mL through 2L sizes. The 5 and 10mL sizes have a funnel top for easier filling. Designed for the low volume user, a convenience pack containing one each of the most popular sizes of Cat.No. 1-3024 cylinders is also available. It contains one each of five sizes; 10mL, 25mL, 50mL, 100mL, 250mL. Nonsterile. Reusable.