Slazenger Hard Court Tennis Balls. <p>The Slazenger Hardcourt Tennis Balls are designed for use on hard courts, with inbuilt technologies to enhance your play. Approved by the ITF, the 4 tennis balls have Hydroguard Technology, to ensure up to 70% more water is repelled than a standard ball. The balls are also Ultra Vis for optimum visibility for players and spectators, the premium woven cloth (Tour Core™) giving the ball increased durability and responsiveness.</p><p>- Tennis balls </p><p>- 4 tennis balls </p><p>- Designed for hard court use</p><p>- ITF approved </p><p>- Ultra Vis (optimum visibility for players and spectators) </p><p>- Tour Core™ (premium woven cloth, gives increased durability and responsiveness)</p><p>- Hydroguard Technology (repels up to 70% more water than a standard ball) </p><p>- Slazenger branding</p>