This three-piece graduated cylinder set is made from borosilicate 3.3 glass and includes cylinders with 250 ml, 500 ml, and 1000 ml capacities. Each cylinder features blue printed graduations, a solid hexagonal base for stability, and a removable plastic protective collar. Calibrated to contain, with Class A tolerances conforming to ISO and ASTM standards. The borosilicate glass is autoclavable with heat tolerances of: Strain Point 515°C, Annealing Point 565°C, and Softening Point 820°C.