No German car enthusiast should travel the autobahn without this right of passage. An official Gewerkschaft der Polizei Sticker/Cling, basically a Police Sponsorship sticker to show your support for the law enforcement.
These are imported directly from Germany and are the real deal. They are excellent quality and look amazing. Rubber cling material means you can reuse it, move it to a different location, or even change it from car to car.
These make great gifts for European car enthusiasts as well as your German friends living here in the states.