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 9.63 x 9.63 x 2.5 inches and interior dimensions 8.88 x 8.88 x 2.5 inches;Proudly made in the USA by Nordic Ware