Wilson US Open Tennis Balls (Twin Pack) PK4 X 2

For more than 40 years, every point at the US Open has been scored with a Wilson US Open tennis ball. Unparalleled consistency and performance make it the gold standard in tennis, trusted by the best in the game when it's all on the line. Crafted with premium woven felt for superior bounce characteristics over the course of three sets, this ball is available in Extra Duty, Regular Duty and High Altitude variations to ensure optimal performance on your preferred playing surface.. Approved by USTA and ITF for competitive play. Official Ball of the US Open. Made with premium woven felt. Extra Duty: Ideal performance on hard, abrasive courts. Regular Duty: Ideal performance on soft, clay/indoor surfaces. High Altitude: Ideal performance on surfaces above 3,000 ft.. Twin pack, each can includes 4 balls (8 balls in total). Balls are numbered to differentiate from balls used by other players on neighboring courts