not sure of measurements but the bottom is the cupcake bottom then the second piece has tiny hole in it and it is inverted ontop of the bottom next the topper is placed upside down in the inverted middle
i used one of these and what i did was i made a double batch of cake batter and divided it up into 2 half for the top and half for the bottom. That seemed to work out just fine lol :) it was really neat for my brothers birthday. I made one for each of his friends which was like 8 haha lets just say that i was cooking up a storm haha :) hope this helps!