Magnetic signs are composed of vinyl with a magnetic backing. They are flexible and lightweight, allowing them to be placed on almost any surface. A vehicle magnetic sign can be used on a car, truck, bus or van with the purpose of advertising a business or organization. Vehicle magnets can be fastened to the door and are usually sold in pairs. For trucks, magnets can be applied to the tailgate as well. Magnetic vehicle signs can encompass graphics, logos and photos along with lettering.