NBA Team Alliance Basketball - Miami Heat Model: WTB3100XBMIA THE TEAM ALLIANCE BASKETBALL: Real fans make their alliances known. Put your pride on display for all to see with the Wilson NBA Team Alliance Basketball. The high-performance Pure Feel Cover equips this ball with pro-level feel, durability and a pebbled surface. BALL SIZE 7 (29.5"): Recommended for boys age 12 and up, NBA Official Size Playing Surface Indoor/Outdoor