If you"re building a police car or any other emergency vehicle, or simply want to add an exciting feature, the Pine-Pro FLASHING LIGHT BAR is perfect for you. Weighing in at about 1/2 an ounce, complete with battery, switch, circuitry and wiring, the Pine-Pro FLASHING LIGHT BAR requires no assembly. The bright, flashing pattern looks great on a pinewood derby car, a slot car or any 1/24 or 1/25 scale model.