Always play to win. The highly-anticipated Diadem Premier Extra Duty Ball (formally called All Court) is available NOW. Perfect for hard court surfaces. Diadem Premier Balls are tournament level tennis balls designed for enhanced durability and consistent playability. Engineered using premium TTI felt, the Premier Ball is ideal for hard court surfaces. The Diadem Premier Ball is sanctioned and approved for ITF and USTA tournaments. (24 three ball cans = 72 total balls)