This is the construction set that introduces kids to the concepts of wind energy as they build one of six wind-powered bots. The 212 pieces snap together without glue to form six different bots that move without any batteries or electricity, including a big-wheel tricycle, quadruped, soaring machine, drilling monster, walking robot, and even a wind-powered yacht. As kids build and experiment, they learn how gears transmit power and torque. An included hand-powered wind generator blows the bots along in the absence of breezes. For indoor and outdoor use. Includes a detailed full-color manual. Ages 8 and up. Box 7 1/4" H x 11" W x 4" D. (1 lb.)