Cakes are made with either a styrofoam or wooden core, depending on if they will get covered with Sculpey and baked in the oven - then they are wood inside. Non-baked cakes are styrofoam covered with drywall compound, and painted. All the 'candies' are made of Sculpey and are ready to be glued on one at a time....
I glued a row of tiny balls in a rainbow pattern around the base of the polka-dot cake layers, and found the effect way too 'dotty', and eye-boggling, so pulled them all off, and made new balls in just two colours. I like it a lot better...