Prince Mono Tennis Racquet Introducing one of the most unique racquets ever made - the Prince Precision Mono 650. With its mono shaft design, it harkens back to the classic days of wood. But make no mistake, this is a modern weapon - fast, firm, powerful and built of 100% graphite. Launched in 1994, this model was famously used by Jimmy Connors (who tuned it with lead and leather). This is not only a great collectors item, but it also provides a very unique hitting experience.