Beaker, Flask, and Cylinder Set, 3.3 Boro. Glass - 3 Pieces - 250ml Beaker, 250ml Flask and 100ml Cylinder, Karter Scientific 214Z2 Contains 1 each 250ml Beaker, 250ml Flask, 100ml Cylinder High quality inert 3.3 borosilicate glass ASTM Specification E960, Type I requirements Heavy Duty Reusable