If a regular rubber ball is not enough for your training purposes maybe you would want to try this one and put your reflexes on a true challenge.
SKLZ Reaction Ball is actually a ball consisted of six smaller rubber balls. It’s made of a high-bounce rubber. Once you throw it on the ground it bounces in a random direction. This makes it perfect for training your reflexes.
With this kind of performance, it can be used as a part of your training equipment for all sports like baseball or tennis.