The Dunlop squash ball is the official ball of the World Squash Federation.
The Progressive ball in the red pack is for those players who have improved beyond introduction, but are not yet at competition level.
The ball has a 20% longer "hang time" over the double yellow dot professional ball, which also results in a longer hit.
It is 6% larger than the Professional or Competition ball to allow the player every chance to hit the ball on the racquets sweet spot.
Pack of 3 balls