The AirBake Insulated Aluminum Cookie Sheet is a 20"x15.5" rectangular baking sheet made of durable aluminum material. It is designed for use in both electric and gas ovens, making it versatile for various baking needs. The cookie sheet is easy to clean and features a silver color, adding a sleek and modern touch to any kitchen. Made in the United States, this original baking sheet set includes a single high-quality piece that is perfect for making delicious homemade cookies and other treats.