Complete construction set with motor and battery tray. With over 600 components, you can build a motorized Ferris wheel or a merry-go-round. The Ferris wheel has a diameter of over 50 cm (nearly 20 inches!) and is equipped with six gondolas--truly a model that creates a real fair atmosphere! Requires: 9V battery (not included)Product Measures: VariousRecommended Ages: 7 years & Up