Bakers Big Sheet natural aluminum nonstick commercial bakeware is made of pure aluminum which will never rust for a lifetime durability Baked goods rise and bake evenly due to aluminums superior heat conductivity and the reinforced encapsulated steel rim prevents warping NonStick interior for easy realease and clean-up, hand wash only Pan exterior dimensions 17.88 x 13 x 2 inches and interior dimensions 17.13 x 12.13 x 2 inches. Made in the USA.