Add extra challenges to lower body workouts by putting these adjustable-strap medicine balls on your ankles. Remove the straps and the rubber, hollow-cored, bounceable balls become easily passable from one person to another. The flexible straps adjust easily to fit small or large hands. Additional weights sold separately: 2 lbs. (7.75" dia.) see #W38825; 4 lbs. (7.75" dia.) see #W38826; 6 lbs. (9" dia.) see #W38827; 10 lbs (9" dia.) see #W38829; or save when you buy a set of 5 (see #W38830).