High Quality: These reflex balls are made of durable and high-density rubber and consist of a six-hemisphere design creating dynamic and superlative bounce and carom. It is great for all hard surfaces. Improve Reflexes: Helps build reaction speed, motor-sensory skills and peripheral vision tracking abilities. Improve your coordination and reflexes. Also can be used as a rehab and exercise tool. Instant Feedback: Reaction Ball is designed to bounce randomly, Get a better analysis of your players engagement with the ball as you receive instant feedback on the their reaction time, so you can enhance your hand-eye coordination and improve reaction time. Multi Application: Great training tool for all sports: Baseball, Football, Soccer, Tennis, Taekwondo and Basketball training. Train Anywhere: Exercise your agility and speed no matter where you are. Measuring only 2.75in/7cm in diameter.