Stainless Steel Outside and Inside Layers - high strength, resistance to rusting and does not react when in contact with food. Provides for a brilliant luster finish. Aluminum Middle Layer - Excellent heat conductor and provides for even heat distribution in pan. Only low to medium heat in necessary for stovetop cooking. Fully Guaranteed against defects in material and/or craftsmanship. Classic Clad cookware is dishwasher safe, however J.A. Henckels Intenational recomends hand washing to maintain the brilliant luster. Can be used on all popular cooking surfaces.