Prince O3 Speedport Black MP Tennis Racquet Power Level 975 Headsize 100 sq in Weight 10.8oz/305g unstrung Balance 12.6in/32cm, Head Light Length 27.0 inches The O3 Speedport Black provides advanced level players more feel in an aerodynamic mid-wide frame Choose the String Port Insert for a softer feel with improved string damping Fine-tune the feel of your racquet with the Speedport Tuning System (STS) O3 engineered racquets are created through a one step fusion process that utilizes the strongest structure known to man, the Arch