The beautifully polished MagDerby primary medallion is precision machined from aluminum and then custom enhanced to your specifications. It's the final touch of personalization that makes your bike uniquely yours. Simple installation. The powerful neodymium magnets make the snap fit free of screw heads and provide the largest graphic area. Installation is less than 3 minutes. Fits only the stock Harley Davidson Twin Cam Series Engines, including the low profile primary case.