Introduces simple mechanisms such as gears, levers, and pulleys to young children. 102 DUPLO®-size pieces including gear wheels, beams, pulley wheels, axles, crown gear, worm gear with housing, 12 activity cards, eight instruction cards including 14 different models to build, four real-life cards including seven different scene-setting environments to build from, and a sturdy storage box with transparent lid. Grades K-3.