A unique, open-ended marble-run building experience; Watching them go is like magic in slow-mo! The paths cut out of each track widen gradually to propel the marbles forward with mesmerizing grace. For Ages 8 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs. CHOKING HAZARD -- Toy contains a marble. Not for children under 3 yrs.