Cupcake pan / muffin pan made of aluminized steel with silicon glaze coating. 3 rows of 4 cupcake molds. 2-3/4" top, inside. 2-1/16" bottom, outside. 1-3/8" vertical depth. 4"/4" centers. Cupcake Pan holds (12) 2-3/4" dia. cupcakes, 3 rows of 4, 12-7/8" x 17-7/8" overall, glazed aluminized steel