Get rolling with the Kullerbu Windmill Track Set! Kullerbu is a fun, and customizable ball run for children two years and older. It includes many unique track elements like a windmill, bell, and loop-the-loop that can be mixed and matched in numerous ways. Hours of mesmerizing play await! Combine it with other Kullerbu sets for even more fun! Includes a  windmill wheel ramp, large gateway, archway with bell, steep ball curve, a variety of tracks, and three balls. Balls are 1 3/4" in diameter.