The A&R Reaction Ball is a fantastic tool to improve reflexes, reaction time, and hand-eye coordination. Built with a high-density rubber that is molded into an irregular shape, the Reaction Ball when thrown against a wall or the ground comes back at an unpredictable path. This forces you to quickly react to its movement in order to catch it again. Great for all players, especially goalies, the Reaction Ball is a useful addition to a pre-game warmup or off-ice training session.