This racetrack can be configured hundreds of ways, either by following the 30 plans provided or by turning loose the limitless imagination of young car enthusiasts. The 150-piece set of flexible loops, straightaways, and curves can be constructed in courses as simple or complex as children desire, unlike other track sets that can only be built one way. The track comes with two specially designed, spring-driven cars that hug the contours of the track for complete courses. The friction mechanism provides just the right amount of propulsion, and one car features "bump and go" technology that holds a primed motor motionless on the track until the first car completes its lap; when the two cars tap bumpers, the second car is unleashed for an immediate lap of its own. Ages 4 and up. 19" H x 13 3/4" W x 11" L. (12 1/2 lbs.)