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