Wilson US Open Extra Duty Tennis Balls - tube with 4 balls For more than 40 years, every single point at the US Open has been scored with a Wilson US Open tennis ball. Unmatched consistency and performance make it the gold standard in tennis, and it is trusted by the best in the game when it really matters. This extra durable ball is crafted with premium woven felt, providing superior bounce over three sets and is ideal for use on hard, abrasive courts. Each can contains 4 balls, and each box contains 18 cans. Wilson US Open Extra Duty Tennis Balls are your key to ultimate performance on the court. Take control of your game with these balls that offer exceptional consistency and bounce. Their durability ensures they can withstand even the most intense matches on hard surfaces. So what are you waiting for? Experience the quality of Wilson US Open Extra Duty Tennis Balls and take your game to new heights on the court. Give yourself the best tool to prove your worth as a tennis player.