10 inch bottom tier, 6 inch top, 4 inch smash. The cake started to lien en route to customer's! I made an emergency pit stop at a local cake decorating store. The lady was so nice - she had me bring in the cake and helped me fix it. I learned a big lesson! I didn't space out my dowels enough I guess... Anyway, the customer loved it. The smash cake is BC with fondant and CT details. The main cake is BC with CT details. :)