<ul><li>USTA and ITF Approved</li><li>Wilson is the official ball of the us open and Australian open grand slam championships as well as the official ball of NCAA tennis (men and women)</li><li>Extra duty ideal for longer play on hard court surfaces</li><li>Exclusive dura-weave felt from Wilson provides greater durability and improved performance</li><li>Ideal ball for all levels of tournament and recreational play</li></ul><br><br>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 other brand. Wilson, the Official Ball of Australian Open, US Open, Davis Cup and the Fed Cup.

Wilson Championship Extra Duty Tennis Ball 4 Pack | Pressurized Balls with Seal Design | Highly Elastic, Ideal for Training & Matches - Yellow