Le Creuset Stoneware 14" Au Gratin Dish, Fennel High-quality exterior enamel to protect against metal marks and other damage Hard-wearing, impermeable finish fired at temperatures as high as 2192f is safe for cutting on with knives Unmatched thermal resistance from -65f to 500f  safe for the freezer, microwave, oven, broiler and dishwasher Less than 1% porosity, blocking moisture absorption which can lead to cracking, crazing and rippling along the interior Unique clay mixture creates a very dense material when fired, maintaining even temperatures and preventing scorching