HEAD PERFORMANCE: Born out of revolutionizing how we ski and play tennis, HEAD has constantly pushed athletic equipment into the modern era. Pairing decades of experience with modern tech; HEAD offers nothing but the best squash equipment available. HIGH LEVEL BALL: HEAD Prime is a double yellow dot squash ball; the highest level ball for serious players. Suitable for all indoor and outdoor play conditions. CONSISTENT PLAY: Players all over the world choose HEAD time and time again for reliable bounce and play not found in any other squash ball. THE DOTS: Please note that double yellow dot balls are typically reserved for experienced squash players. If you're an entry level player; consider purchasing a blue or red dot ball! TRUE DURABILITY: Durable rubber ensures the all courts squash balls will play like new for as long as possible.