Sportime Multi-Purpose Inflatable All-Balls, 4 Inches, Set of 6 The Sportime Inflatable All-Ball has a high-tactile surface, which is easy to hold and catch. It is made with our seam-free rotational molding process, and includes a standard athletic valve to adjust the size, bounce and resistance. Balls can be used for juggling, paddleball activities, baseball, softball, hand exercises, and more. Measures 4 inches in diameter. Multi-purpose ball for field, gym, or classroom activities