VWR Hexagonal Base Measuring Graduated Cylinder 50 mL Case of 12. Manufactured from ASTM E 438 Type 1 Class A Borosilicate 3.3 glass. These cylinders are Class A calibrated to contain with a pour spout. The cylinders have a large hexagonal base a bumper guard (except 10 ml) and are printed with a double scale. A batch certificate is included. Package Contents: VWR Class A Measuring Cylinder bumper guard (except 10ml) VWR 76004-050-CS: Hexagonal Base Measuring Graduated Cylinder 50 mL Case of 12