Material: The reaction ball is made of high-density rubber, which is highly elastic and durable, with a diameter of 2.17 inchesInstant Feedback: The baseball agility reaction ball can better analyze the player's interaction with the ball and receive instant feedback on their reaction time, so you can develop hand-eye coordination, improve reaction ability, and develop quick reactions for all sportsMulti-Sport Training Tool: The reaction ball is a fun ball that can develop depth perception, improve agility, improve coordination, and improve speed; it can develop quick reaction ability for all fielding positions in baseball and softball, and is a great training tool for all sportsExcellent Bounce: When this six-sided high-bounce ball lands, it makes unpredictable jumps/bounces, forcing the user to make quick decisions and directional movements to retrieve the ballTrain Anywhere: Use alone, bounce off any hard surface or volley with a team in a group environment; the ball is suitable for all hard surfaces such as walls, grass, concrete, garage doors, etc.