Dunlop Fort Balls are designed for match use on all surfaces thanks to the Dunlop HDurability Core for long lasting shape retention and playability. These Dunlop Tennis Balls also benefit from a Flouro Cloth outer for greater visibility and harder wear, perfect for low light conditions. The classic Dunlop Fort Core has been re-mastered and re-engineered to a much higher specification resulting in Dunlop HD core technology, which increases the durability and maintains consistent playing characteristics of the ball allowing players to have complete confidence in their game. The Dunlop Fortis USTA and ITF approved for tournament and league play.The Dunlop Fort All Surface can contains 3 balls per can.