Made of aluminized steel with reinforced rims and corners for extra durability. * 17 3/4"L x 12 3/4"W x 1"H * The exclusive Swiss-made nonstick coating will never chip or peel, and the surfaces will never bend, warp, rust or corrode. * Two-coat Swiss-made nonstick ceramic finish is 10 times tougher than ordinary nonstick coatings. * Professional-gauge aluminized steel. Rolled lips add tensile strength and rigidity to prevent warping.