Material: The reaction ball is made from high-density rubber with high elasticity and durability, weighs 4.02 oz and is 2.6" in diameter Instant Feedback: The baseball agility reaction ball better analyzes player's engagement with the ball as receive instant feedback on their reaction time, so you can develop hand-eye coordination, improve reflexes, and generate quick reactions for all sports play Multi-Sport Training Tool: The reflex ball is a fun ball for developing depth perception, boosting agility, improving coordination, and enhancing speed; it develops fast reflexes for all fielding positions in baseball and softball and is a great training tool for all sports Superlative Bounce: 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 Train Anywhere: Use alone by rebounding off any hard surface or volley with a team in a group environment; the ball works against all hard surfaces, such as walls, grass, concrete, garage doors, etc The reaction ball is made from rubber with high elasticity and durability, 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 creating hand-eye coordination, improving reflexes, and generating quick reactions for all sports play. It can be used on all hard surfaces, such as walls, grass, concrete, garage doors, etc.