Naturals commercial bakeware is made of pure aluminum which will never rust for a lifetime of durability. Foods bake and brown evenly due to aluminum’s superior heat conductivity With tall sides for larger capacity. Accommodates double and triple size recipes of brownies and bars! For sweet or savory baking; from brownies to sheet cakes to sheet pan dinners, this is the pan you’ll reach for Reinforced encapsulated steel rim prevents warping and adds strength Pan exterior dimensions 17.88 x 12.88 x 2 inches and interior dimensions 16.5 x 11.38 x 2 inches. Easy clean up; hand wash recommended. Proudly made in the USA by Nordic Ware