The Grand Prix series offers 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.MaxGlo felt, which is 14% brighter than regular cloth, allows the player to see the ball earlier, lending more time for shot preparation. USTA and ITF Approved for tournament and league play.Sold ONLY by case (24 Cans).