Nordicware Naturals 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. Reinforced encapsulated steel rim prevents warping. Made in the USA. Pan exterior dimensions 17.88 x 12.88 x 1.06 inches and interior dimensions 16.5 x 11.38 x 1 inches.