Build a mighty robotic bug that defies gravity to crawl up, down, and all around windows with ease! Gravity Bug Microbot Kit makes a multi-legged machine that uses an ingenious system of suction cups to walk on smooth vertical surfaces like windows and glossy panels. There is one experiment inside, and you can learn about suction cups while you build your bug microbot. Assembled Dimensions: Length: 4 1/2" Width: 4" Kit contains 78 pieces. Note: Requires 1 AAA battery (not included).