The Champion Sports Swing Ball Set offers a fun cardio exercise for kids and adults that can be played alone or competitively in a group. Simply slip your foot through the ring and start swinging the corded ball with your ankle; the aim is to keep jumping over the ball and cord without missing a jump or stepping on the cord. Made of durable plastic, this set of six swing balls is easy to use, clean and maintain. Diameter: 5.5"; Material(s): Plastic; Color(s): Blue; Green; Orange; Purple; Red; Yellow; Quantity: 6/Set.