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. Cord is 18" Long and is durable but gentle on legs for added safety. Ankle ring is 5.5" Diameter slips over most feet easily. Set of 6 (1 of each) Green, Orange, Purple, Red, Royal Blue and Yellow