This Granite Ware 18 in. covered oval roaster browns better and cooks more evenly than any other roaster. The dark interior absorbs all the oven s energy the steel core evenly distributes the heat and the glass interior doesn t alter the taste. Ideally suited for a 15-pound roast this oval roaster boasts even heating and faster cooking times because of its unique construction. Porcelain is fused to the steel at 2 000 degrees Fahrenheit producing a non-porous inert glass surface that is naturally non-stick. Porcelain can chip if dropped however this does not reduce the effectiveness of the cookware. They are safe for metal utensils easy to clean and dishwasher safe!