Covered in MMF. Not my cleanest work but I was in hurry to finish on a late night. :) this was for my nephew but hoping some of the pictures can help someone else who may need to carve a cake like this. The cake itself was the bottom half and I used a 1/2 sheet cake cut into 3 equal strips so about 6" wide on an 18" pan. The top half was Rice Krispies simply because it was quick and we didn't need more cake! :) tires were Rice Krispies as well.