THE WORLD'S MOST POPULAR SQUASH BALL IN A CONVENIENT 3 BALL TUBE. The official squash ball of the World Squash Federation (WSF), Professional Squash Association (PSA), and Women's International Squash Players Association (WISPA) and the only ball used in all international squash competitions. An extremely durable high quality rubber compound, unique to Dunlop comprises of 12 special ingredients that provides the ultimate performance squash ball for professional, tournament and team players. New packaging: 3 double yellow dot squash balls in a tube