Corning Pyrex 5600-1L Borosilicate Glass 1L +/- 0.3mL Flat Bottom Class A Lifetime Red Volumetric Flask, with Polyethylene Snap-Cap Capacity: 1000mL; height: 310mm; outer diameter: 125mm; tolerance: +/- 0.3mL Made from borosilicate glass code 7740 Flat bottomed volumetric flask has a beaded rim and a long neck style - and comes with a blue No. 1000 high density polyethylene snap cap Lifetime red capacity mark is etched as a fine line through a narrow red band into clear glass - making a filler unnecessary Manufactured to Class A tolerances as established by ASTM E-694 - ASTM E-542 - and ASTM E-288