DUNLOP 602157USCS Grand Prix Hard Court Ball Case The ultimate in performance and durability. A special mix of 14 ingredients make up the secret rubber core formula which is combined with the finest woven felt to produce a ball for outstanding performance and feel. Breakthrough technology of MaxGlo felt is 14% brighter then regular cloth. This allows the player to sight the ball earlier, giving more time for shot preparation. 24 Cans per Case. 24 Cans per Case.