Attempting to get your business up and running? Car sign magnets are a valuable marketing tool! These 3 x 12 always-in-stock items are the perfect size for your vehicle's bumper and are approximately 0.035 thick. When used properly, car sign magnets can easily be removed and reused without leaving a residue. With your customized magnet prominently displayed, building brand awareness can be a smooth ride. Remove weekly for surface cleaning. automatically added.