Available in orange or yellow they will stand out if you inadvertently drop them into the grass in the pits. But there's really no need to lose them as they include a handy little magnet so that you can fix them to any metal object in your flight box.
Each plug has a handy ring so that they can be easily pulled out of the engine's exhaust before flight. They also feature three different steps, allowing them to be used in exhausts ranging from 6 -12mm in diameter.
