Nordic Ware Natural Aluminum Commercial Baker's Half Sheet with Lid Natural aluminum commercial bakeware is made of pure aluminum which will never rust for a lifetime of durability Baked goods rise and bake evenly due to aluminums superior heat conductivity and the reinforced encapsulated steel rim prevents warping Easy clean up, hand wash only Pan exterior dimensions 18.44 x 13.13 x 2.25 inches and interior dimensions 16.88 x 12.13 x 1 inches Proudly made in the USA by Nordic Ware Large baking sheet for cookies, biscuits, breads, brownies, and more Efficient aluminum construction heats evenly for consistent baking Plastic lid snaps tightly around edges to keep contents fresh Hand wash only Made in the USA