Reaction BallsThe reactions balls are constructed of 100% solid rubber. The reaction balls provide unpredictable bounces and are ideal for improving hand / eye coordination, balance, quickness and depth perception. Reaction balls are a must-have for football, baseball, soccer, basketball and volleyball. It can be used on virtually any hard surface. Please choose size or the set of two.Item # RXB7 (Baseball Size) RXB10 (Softball Size) RXBSET (Set of two)