Increase your team's shooting power and arm strength with the Champion Sports 4 lb. Weighted Basketball Trainer. This weighted black basketball is regulation size (29.5"-30") and covered in a durable, composition rubber that can take a beating on any court, indoors or outdoors. Weighing 4 lbs., this training tool will help develop stronger arms and a wider shooting range, all while transitioning smoothly between drills and regular games thanks to its official size.