Foam balls that fly on pure air. Kids build tube runs, switch on the airflow, and watch balls shoot through the course they made — or hover impossibly in mid-air above the stream.Every rebuild is a physics experiment in disguise: airflow, trajectory and cause-and-effect, learned by doing. Adjustable speed and up to 7 hours of play per charge.Includes the air base, build tubes and 20 foam balls. Recommended for ages 3 and up.