Use stored potential energy to catapult a wooden ball into the air with this exciting robot-themed domino set! A tipper car, crazy ball track, tipper arm and series of ramps form an exciting robot production line that you can build again and again. For ages 4 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs. WARNING: CHOKING HAZARD—Toy contains a small ball. Not for children under 3 yrs.