Premium Rubber Coated Bar Magnet - Demo License Plate Holder (1 Bar & Hardware) THIS MAGNET WILL ONLY ATTACH TO A METAL SURFACE LIKE THE REAR PANEL. MOST CAR BUMPERS & PANELS ARE NOT METAL, BUT PLASTIC. CHECK YOUR SPECIFIC APPLICATION BEFORE PURCHASING. Extruded rubber coated bar magnet for license plates High quality hardware included Great for car dealerships and demo plates These license plate magnets are used by thousands of car dealers nationwide