Dedicated for professional players & competitive events, the Dunlop Pro are designed as the official balls of the World Squash Federation, Professional Squash Association & Women’s Squash Association. They’re made to last through the toughest conditions, & to ensure the most consistent playability when used by advanced players, thanks to the N-1SR Molecular technology. The diameter of the balls is standard (40mm) & they are supplied in two tubes – each featuring 3 balls.