All-Balls Sportime Multi-Purpose Inflatable Balls are designed for many fun activities. Use them for juggling, paddleball, baseball, softball, hand squeeze exercising and much more. This set of six Sportime balls are manufactured by a seam-free rotational molding process that assures balls will never break apart or peel. Size, bounce and resistance can be adjusted through a standard athletic valve to accommodate a variety of applications. These sports balls are easy to catch and hold and provide a fun way to do hand exercises.