The Fitness Mad Reaction Ball Large is perfect for improving hand-eye co-ordination and reaction times. Manufactured with a deliberately uneven surface, this reaction ball will bounce erratically and unpredictably. It's a great training aid for all ball sports and can easily be used by bouncing it on the ground, against a wall or with a training partner. Have fun whilst training by trying to catch it after it has bounced. Using the reaction ball over time will improve your reaction times.  Measuring 9cm in diameter and weighing 160g, it's easy to transport and store.