Kimax® Graduated Cylinders "To Deliver" are permanently marked with an individual serial number. Supplied with a Certificate of Graduation Accuracy. Provided with a hexagonal base flat ground for stability. SAFE-GARD bumpers are supplied with sizes 25 through 1000 ml The 10 mL size has an enlarged funnel-shaped top for ease of filling. Designed from ASTM Specification E1272, Style 1, Class A requirements.