Skyrail Suspension Rollercoaster with Elevator

Construct a suspension system then send marbles racing around the course. It takes just the right amount of tension to race all the way to the bottom without falling off or rolling back. As marbles reach the bottom of the coaster, the battery-operated elevator lifts them to the top in an endless stream of gravity-powered excitement Includes 15 feet of track, 4 marbles and a detailed instruction booklet Perfect for demonstrating gravity, speed, inertia, centrifugal force and other principles of mechanics and physics.