Our Hop-Along Balls are big on bounce and full of nonstop muscle-building fun! Perfect for use indoors or outside on the grass, the balls feature specially designed, easy-grip handles that provide maximum comfort and control…and they’re flexible, so they couldn’t be safer for kids. Balls are easy to inflate and deflate with our Automatic Ball Inflator (sold separately below). Large ball measures 22" in diameter and comes in blue.