The Nike© Tour Accuracy golf balls use new technology to make a high spinning three-piece golf ball. The inner core of the Tour Accuracy is made of polybutdiene is made oversized to help hit long shots with the driver. The ionomer layer helps transfer energy from to the core on longs shots and on the short shots it works with the outer cover to help the ball check and spin. The outer cover is made by the injection molding of polyurethane. Injection molding helps to make a uniform and seamless outer cover. Injection molding is a very consistent process that makes consistent products.