SportimeMax Blue Playground Ball sized 8-1/2 inches, features a tough rubber shell and has a 70% butyl bladder for superior airtight inflation. This high-optic yellow color of the ball provides children with an ideal color they can easily see. It features a 2-ply natural rubber construction that is essential to maximize the air retention. The FlexMatrixGrip pattern is formed by thousands of hexagon shaped cells that freely flex under the pressure of grasping. Sold individually.