Chicago Metallic Professional Nonstick Cookie Sheet, 15.75-Inch-by-13.75 Inch This traditional cookie sheet provides a big, flat surface for baking Made from heavy-weight aluminized steel for superior heat conduction and even baking Easy release, silicone based, non-stick coating for ease of baking and cleanup Provides a big, flat surface for baking Dishwasher safe, however hand-washing is recommended to extend product life