Color-coded plyometric balls available from 1 to 30 pounds. Balls have soft, flexible rubber exterior shell. Balls have easy-to-grip rubber surface. Textured tactile surface is easy to grip, grasp and catch. Increase or decrease air in the ball to make ball easier to grasp. Use for upper body rehabilitation and fitness exercises. Balls can be used with trampoline rebounder and thrown back and forth with a partner.