Similar to their electric guitar counterparts, vehicle fenders totally rock. While the fenders on your car don't play any heavy metal music, they do protect the underside of your car from the elements on the road such as mud, pebbles, sand and other debris. Fenders cover both the front and rear wheels of your car, starting where the door ends and running alongside the car to the bumper. Fenders are normally the same color as the body of the vehicle, but may be decorated to suit any taste.