The Slazenger Hardcourt 4 Pack Tennis Balls are designed for use on hard courts, with inbuilt technologies to enhance your play. They feature the Tour Core that has been designed to meet the needs of competitive play and the Hydroguard technology that repels up to 70% more water 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. It has High visibility for a hardcourt tennis match. Add some style to your game with the Slazenger Hard Court 4 Ball.