HEAVY DUTY: it's made of 1 mm-thick carbon steel with an electroplated finish, protecting it from rust and warping; oven safe to 220C. QUANTUM II NON STICK: a double layer of this powerful coating ensures easy release; it's PFOA, PTFE and BPA free, and dishwasher safe. VERSATILE OVEN TRAY: bake, grill or roast your favourites, or use it as a lid for MasterClass's square tin (KCMCHB13 - sold separately). USEFUL INFO: this square baking tray measures 26 x 26cm (10 x 10 inches); fridge and freezer safe.