Wilson US Open High Altitude Tennis Ball (4-Pack), Yellow Sandals String Pattern: 16 Mains /

String Pattern: 16 Mains / 19 Crosses

These tennis balls have been tested by the USTA and ITF

Net poles (like ones on a tennis court) are required to play

'' are found

Wilson US Open High Altitude Tennis Ball (4-Pack), Yellow Sandals String Pattern: 16 Mains /Brand: Wilson Color: Yellow Features: Made with premium Tex Tech felt High altitude core for best performance on courts above 3500 ft. Wilson has been the official ball of the US Open since 1978 Publisher: Wilson Tennis Details: Unbeatable performance, unmatched consistency and the most premium woven felt all add up to more W's for you. Wilson is used at more than 45 professional tournaments worldwide. That's why we are played at more majors than any