Naturals commercial bakeware is made of pure aluminum foods bake and brown evenly due to aluminum’s superior heat conductivity. Reinforced encapsulated steel rim prevents warping and adds strength Extra-large capacity pan holds more food than a standard sheet, allowing you to bake more in each batch. For sweet or savory baking; from cookies to sheet pan dinners, this is the pan you’ll reach for. Encapsulated galvanized steel rims stand strong against warping, preserving the shape and quality of your pans through numerous uses. Compatible with parchment paper or silicone baking mats if desired. Easy clean up; hand wash recommended. Baking set includes two extra large Big Sheet pans, each pan measures 21 x 15 x 1 inches and baking surface 20.3 x 14.3 inches. Made in America of domestic and imported materials. Our aluminum bakeware-quality pieces are made to withstand a lifetime of use in your home kitchen.