Cover Material: Varies by model. The Team Tribute or Team Alliance versions typically use a high-performance rubber or composite leather designed for durability on both indoor and outdoor courts. Seams: Features NBA Pro Seams, which are deep-channel grooves designed for better grip and control. Internal Bladder: Equipped with a pressure-lock bladder to improve air retention and maintain the ball's shape over time. Size 7 is the standard size for men and boys ages 15 and up, including high school, college, and professional play.