Lime Green PlasmaCar - Turn the steering wheel and away you go. The PlasmaCar uses the most inexhaustible of energy sources - kid power. With no batteries, gears, or pedals, the natural forces of inertia, centrifugal force, gravity and friction are harnessed to propel children forward. It's great exercise indoors or outdoors and holds up to 220lbs on a smooth, flat surface.