The layered metal used to create the Gourmet Standard 17-inch Tri-Ply Cookie Sheet helps evenly bake cookies and cakes. This generously sized cookie sheet features an aluminum core with two layers of stainless steel. It features a lifetime warranty backed by Gourmet Standard. For almost a decade, Gourmet Standard has been creating innovative kitchen essentials in stainless steel and aluminum cookware, bakeware, accessories, and more. Its specialty cookware product lines impress both customers and the food industry with their usability, durability, and style.