Spalding ZI/O excel tournament the Spalding 74-870 ZI/O excel tournament is a pure example of everything an indoor/outdoor Basketball should be. The official ball of the NBA, Spalding meets all stringent official size and weight specifications. The exclusive ZI/O PU premium composite leather construction features the addition of a foam backing under the full ball pebbling to make handling even more precise. The deep channel design is 30 percent deeper for even better grip and dribble control. Additionally our ZI/O excel tournament ball has a composite leather cover along with deep channel grooves for better dribble control. This ball is designed for competitive indoor or outdoor play.