The reaction ball is made from rubber with high elasticity and durability and is 2.6" in diameter. When this six-sided high-bouncing ball lands on the ground, it takes an unpredictable hop/bounce, forcing the user to make quick decisions and directional movements to retrieve the ball. Thus, it creates hand-eye coordination, improves reflexes, and generates quick reactions for all sports. It can be used on all hard surfaces, such as walls, grass, concrete, garage doors, etc.