O3 Speedport Tour Perfect for advanced, attacking players looking for a crisp hitting feel and great control.Wind tunnel testing proves O3 Speedport rackets move through the air up to 24% faster than traditional racquets. So you can hit your best shots. More often.Laboratory testing proves that O-Ports strengthen andstabilise the frame for up to a 59% bigger sweet spot, creating a sweetzone.Sepcification:Headsize: 56in2 / 361cm2Cross Section: 11 9 11 - 10String Pattern: 22 x 21 Weight: 86.5g unstrung. Balance: 28.7cm. Length: 26.5in / 67.3cm. Shaft Stiffness: 9Grip: Dura. Zorb