This 3-piece casserole set from Pyrex Essentials is made of borosilicate glass for maximum heat resistance, thermal shock resistance and durability. Remaining stain-free and flavourless, it's oven-safe up to 300°C and can be safely used in the freezer to temperatures of -40°C. It is also dishwasher and microwave safe. The 3 piece set includes 1, 1.6 and 2.3 Litre casserole dishes.