Large Bumpy Ball Set of 2 These massage balls are designed to stimulate touch and build focus on defense mechanisms. It helps build concentration and tranquilize emotions. The contour and size of the bumps were designed to provide ultimate safety. Adds visual and cognitive excitement to your program. One of the easiest balls to pick up, hold, throw and catch regardless of age or ability. Price includes 2 (7" Diameter) balls and the colors vary.