- Borosilicate, with spout and hexagonal base
- Single graduations, with zero at bottom; calibrated "to deliver"
- The 10 mL size has flared top to facilitate filling
- Sizes 25 to 2,000 mL include Safe-Guard® plastic bumpers
Designed from ASTM Specification E 1272, Style 1, Class B requirement. Thomas numbers 3548B14 through B55 have a blue enamel scale. Thomas numbers 3548C12 through C53 have a single, white ceramic enamel scale with bumper.