The Head XT tennis ball is dedicated for tough tournament conditions, and excellent for demanding, skilful players. The balls are designed with good sense and attention to detail to ensure superior responsiveness, great touch and increased bounce. Furthermore, the ball can withstand even hotter temperatures of the court due to the (EN) Core technology. Additionally, the quality has been tested extensively in the laboratories and on the courts, and the balls are shipped in a larger quantity of 6 dozen.