This is the most durable and best made ball on the market! The Grand Prix Series offers the ultimate in performance and durability. Dunlop's secret rubber core formula is made up of a special mix of 14 ingredients which is combined wth the finest woven felt to produce a ball for outstanding performance and feel. The use of "MaxGlo" felt, which is 14% brighter than regular cloth, allows the player to sight the ball earlier, giving more time for shot preparation. 3 balls/can. Tennis Balls 601347-Can