Bakers Jelly Roll Sheet 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 aluminum's superior heat conductivity and the reinforced encapsulated steel rim prevents warping;Easy clean up, hand wash only;Pan exterior dimensions 15.75L x 11.25W x 1.63H inches and interior dimensions 15.125L x 10.625W x 1H inches;Proudly made in the USA by Nordic Ware