Welcome to the fascinating world of mechanical engineering! Make 8 motorized robots that move in different ways while exploring how each one uses gears and other mechanical parts. Building and reading go hand in hand with this complete educational set of 117 large pieces, perfect for smaller hands. Comes with a beautifully illustrated 32-page storybook instruction manual. Requires 2 AA batteries. For ages 5-7 yrs, from Thames & Kosmos.