This pack of 24 rimless test tubes each have a 50mL (1.7 oz) capacity, made from heavy-duty borosilicate 3.3 glass. Each tube features white printed specifications and fire-polished flat edges with uniform 1.2mm walls. Each tube measures 5.9 inches (150mm) tall with a 1-inch (24mm) outer diameter and 22.8mm inner diameter. Autoclavable with superior chemical durability and thermal shock resistance. Can withstand direct flame, high temperatures, and thermal shocks. Heat tolerances include a Strain Point of 515°C, Annealing Point of 565°C, and Softening Point of 820°C. Suitable for culture testing in professional laboratories and science classrooms.