The Spalding 63-592 Infusion Street outdoor basketball is a technologically advanced ball with micro pump that offers a the same great grip, balance, bounce, and weight of a traditional basketball. It's made of a durable microfiber composite leather and features an all-ball pebbling that makes handling even more precise. With the built-in Micro Pump technology, each Infusion basketball can be inflated or deflated at any time. It has an official size of 29.5 inches. The Spalding Infusion basketball meets all of the NBA's stringent performance standards. Each ball is precision engineered so that its built-in Micro Pump doesn't affect balance, weight, rebound, size, or overall playability versus a traditional ball. To offset any added weight, lighter, extremely durable rubber compounds were utilized to keep the weight the same as any other basketball.