This is a 10" cake - I have piped Thomas, James and Percy in the entrance to the tunnels all around the cake. The fourth tunnel is empty so Sir Topham Hatt is looking at his pocket watch - you know how he is about punctuality! I used a brick impression mat for the brick pattern. this cake was so much fun to do. I can't wait until tomorrow to see how my customer likes it! All she said was to do a Thomas cake. She didn't care how I did it.