Young athletes can learn important skills such as hand-eye coordination and teamwork with these US Games Color My Class® See-Through Knobby Balls. These flexible balls are made from a foam-like material and feature tactile bumps for a soft design that s easy to catch. Designed to move slowly through the air these balls are easy to track to help children improve their athletic abilities. Gym teachers can inflate or deflate the balls to adjust the firmness so players of all skill levels can get in on the fun.