Spalding Oversized Training Basketball - Men's If you can knock down shots with the Spalding Oversized Training Basketball, you'll find it much easier to shoot when it comes to the real thing. This ball is larger than regulation to improve shooting accuracy. You won't be thrown off by its weight and/or style, as it is specially designed to bounce like a regulation basketball and weighs the same as an official NBA ball. Made with exclusive ZK composite leather cover material. Designed for indoor play.