18 months & up. What goes up must roll down? Toddlers and caregivers will enjoy hours of educational discovery as they examine this science basic. What happens when the tubes are flat? Do the balls roll more easily through one tube or another? What happens if you place a car or cube in the tube? The possibilities are endless. Includes three tubes 24", 18", and 12" in length and 4 balls 2" in diameter of assorted colors. Adult supervision.