The Dunlop ATP Championship Extra Duty Tennis Ball is the official ball of the ATP and the #1 used tennis ball on the tour. They're designed for hard courts, made with HD Pro Cloth and HD Pro Core for unmatched consistency and performance. Each ball can contains 3 pressurized tennis balls. Contains 12 cans for a total of 36 tennis balls. Now comes in a new, sustainable package; experience the quality you can rely on while making the planet a better place.