This reaction ball is designed to bounce randomly, so athletes can exercise their hand-eye coordination and reaction time. Made of high quality silicone material, sturdy, durable and long service life.Train by throwing the reaction ball against a wall or work with a partner to create drills with bad and unexpected flight paths,exercise silicone reaction ball. A fun exercise that is hard to reaction, so you have to stay on the toes and moving,exercise fitness reaction ball. Train with the reaction ball to prepare for any sport, alertness, and agility,fitness ball.