Farberware Insulated Nonstick Bakeware 15.5-Inch x 20-Inch Jumbo Cookie Sheet, Light Gray Insulated 15-1/2-inch x 20-inch cookie pan features double pan layers enclosing an air pocket that heats and circulates for beautiful baking results Heavy-duty carbon steel construction resists warping; heated air pocket promotes even baking from edge to center with perfect browning The large cookie sheet is top-quality-nonstick bakeware that offers high performance and easy cleanup Oven safe to 450 degrees Fahrenheit, this jumbo cookie sheet set complements the other pans in the Farberware Insulated Bakeware collection Quality Assurance Guarantee