Initially, RPM designed our exhaust tips in chrome. Then we decided that gold would look just as awesome especially when we saw how different all of your paint schemes can be. These tips were designed to add Concours-winning looks to any electric R/C vehicle. These are NOT working exhaust tips. They are merely for appearance. The tip screws on to a 1/8" thick, mock, black, round muffler that has an offset tab for the entire system to be mounted to the body using double-sided foam tape or with a screw.