Ultra Blue Penn Racquetball, America"s #1 selling racquetball. The Ultra-Blue is a great everyday ball for practice and amateur games. It"s also the official ball of the USRA.The ball that set the standard for which all other racquetballs are measured. The world"s #1 selling racquetball has just become the "Official Ball" of the Legends Tour. The greatest players of all time chose the Penn Ultra-Blue racquetball for its long, lively, consistent play. Always a great value, the Penn Ultra-Blue delivers.The microscopic texturization gives the ball bite on every playing surface from grass to concrete.