Winner of the Creative Child Magazine Educational Toy of the Year Award, this is the maple plank construction set children use to build their own swooping, swinging ball runs. The kit consists of 200 identical 41/2"- long pine planks that children stack—without glue or connectors—to create tracks, tunnels, ramps, and chutes that send the two included balls rolling and rollicking through the finish line. The 18-page instruction book has illustrations and guidance for building stable ball runs complete with banks and bridges while teaching young engineers about mass, inertia, force, balance, and leverage. Ages 5 and up. 11" L x 11" H x 7" D. (9 lbs.)