This was a 24 cupcake cake made to resemble a monster truck. It is buttercream with buttercream filled cupcakes and a little royal icing too. The truck was a buttercream transfer. I did the wheels separate from the body and then added the details after it was on the cake. The silver is actually royal icing, it kinda left it with a shiny metalic sheen. I had the worst time making the red for the truck. I made the icing over 24 hrs ahead of time and it just wouldn't darken. I added maroon, a touch of black but still didn't get what I wanted. Oh well hopefully won't have that problem next time since I just ordered some americolor super red & others, can't wait to try that stuff!!