Bakers Quarter 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 12.88 x 9.63 x 1.13 inches and interior dimensions 11.5 x 8 x 1 inches;Proudly made in the USA by Nordic Ware