Narrow bottle diameter allows more efficient storage on shelves, refrigerators, autoclaves. Bottles are graduated to their full working volumes. Available in four sizes: 125 mL, 250 mL, 500 mL, and 1L. Pyrex Slim Line bottles are made from the same Type 1 Class A (ASTM E-438) borosilicate glass as standard Pyrex media bottles for chemical and