With the AirBake Ultra 3-Piece Cookie Sheet Set, you can say buh-bye to burned cookies! AirBake Ultra uses Micro-Dome technology to decrease bake times by up to 15% over traditional insulated bakeware. Now those of you who love using insulated bakeware can enjoy bake times that match your cookie recipes. Two heavyweight aluminum sheets surround a layer of air. The air reduces the temperature of the metal that comes in contact with the food. This ensures that the food is heated evenly all around - pizzas bake more evenly, cookies don"t burn, and baked goods are moister and fluffier. Includes 3 cookie sheets: small - 14" x 9-1/2", medium - 12" x 14" and large - 16" x 14". 3-Piece cookie sheet set Small - 14" x 9-1/2" Medium - 12" x 14" Large - 16" x 14" Micro-Dome technology to decrease bake times by up to 15% over traditional insulated bakeware. 2 Heavyweight aluminum sheets surround a layer of air. Air reduces the temperature of the metal that comes in contact with the food. Food is heated evenly all around. 100% Aluminum construction No more burning - guaranteed! Guaranteed not to rust Dishwasher safe