Certain foods require constant, even heat in order to cook properly, which requires a flat, tight-fitting lid. Rice and many other grains will not come out perfectly without a lid that holds in every degree of heat and every wisp of steam. This is why the best flat cookware lids have a recessed center which allows for a tighter seal around the rim of the saucepan, frying pan or pot. Available in mirror-finish or brushed aluminum, flat cookware lids come in standard sizes, from tiny 6-inch saucepans to 10-3/4 inch flat cookware lids made to fit frying pans. Flat lids are as easy to clean as they are to store.