Co-designed by Roger Federer and engineered for the next generation of tennis legends, the new Pro Staff continues to deliver supreme performance, feel and class. Inspired by a sleek all-new design, aspiring tennis players everywhere will hold a psychological edge on their competition - if they’re bold enough to pick one up. HEADSIZE 97 / 626 cm2 UNSTRUNG WEIGHT 11.1 oz / 315 g LENGTH 27 / 68.6 cm UNSTRUNG BALANCE 31 cm / 10 pts HL STRING PATTERN 16 x 19 CROSS SECTION 21.5 mm Flat Beam