The Slazenger Wimbledon tennis balls are designed for highly competitive events, for serious players and to commemorate the grand slam tournament. The balls are made with premium woven cloth and Tour Core to ensure a great balance of responsiveness, consistency, and great speed, whereas the Hydroguard technology offers enhanced moisture and water repelling properties. The balls offer increased visibility due to a patented Ultra Vis dye, and they are approved by the International Tennis Federation. Supplied as 12 dozen (144 balls in total).