The benchmark for tennis balls for decades, the Slazenger Wimbledon tennis balls are ITF (International Tennis Federation) approved and designed to provide ultimate performance during the most prestigious tennis tournament. They are suitable for use on all court surfaces and feature a premium woven cloth for a combination of durability and responsiveness. The cloth is made with Ultra Vis dye for improved visibility on the court, whilst the exclusive Hydroguard technology allows the cloth to repel up to 70% more water than a standard tennis ball. For greater longevity, the balls have special Tour Core. They are supplied in a tube of 4.