Nordic Ware Natural Aluminum Commercial Muffin Pan, 12 Cup 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 aluminums superior heat conductivity and the reinforced encapsulated steel rim prevents warping Easy clean up, hand wash only The standard muffing pan has 12 cups Proudly made in the USA by Nordic Ware