SPECIAL: Buy 10 or more cases and get FREE shipping!The Wilson Championship Extra Duty tennis ball offers traditional performance with a durable felt. The Championship Extra Duty features Wilson`s exclusive Dura-Weave felt for greater durability and increased performance. The Extra Duty felt is made to handle the hard court surfaces. Also available is the Wilson Championship Regular Duty felt tennis ball for clay or indoor courts.The Wilson Championship Extra Duty case contains 24 cans (3 balls per can- 72 balls per case).For more information on Tennis Balls or Tennis Ball Machines check out our Tennis Express Buyer`s Guide.The Wilson Championship Extra Duty ball case is just one of the many products from the Wilson tennis brand. Ball Cases can ONLY be shipped to addresses within the Continental United States.