Pack of 12 heavy duty beakers made of high quality, heavy duty, borosilicate 3.3 glass. 5mm thick, uniform walls provide excellent strength against breakage. 250ml capacity. Beakers feature 50ml white, printed graduations and has a ±5% accuracy. Each beaker measures 4.3 tall, and has an inner diameter of 2.5 and an outer diameter of 2.75.Microwavable and autoclavable, with superior chemical durability. Low temperature gradient- can withstand high temperatures & thermal shocks. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point 515°C | Annealing Point 565°C | Softening Point 820°C.Eisco Labs proudly manufactures its own products using state-of-the-art equipment, and following the highest standards of quality control.Each product is carefully designed by a team of laboratory professionals and experienced engineers with quality and durability in mind. They are manufactured with only the highest grade, raw materials and according to international quality standards to ensure that they can withstand use in even the toughest laboratory environments.