The next generation Pro Staff series starts with Roger Federer's personal racket. Meticulously play tested and developed by the greatest tennis player of all time, the RF97 Autograph is now more powerful while maintaining the classic Pro Staff feel players have come to love. The new power is delivered with a larger head size and sweet spot than the previous generation and shines with a brand new classically modern red and black aesthetic.Larger HeadsizeBigger SweetspotAmplifeel TechnologyBraided GraphiteHeadsize: 97 in2Length: 27”Unstrung weight: 12 oz / 340 gStrung weight: 12.6 oz / 357 gUnstrung balance: 12 HL / 30.5 cmStrung balance: 12.38in / 31.45cm / 9 pts HLSwing weight: 335Stiffness: 68Beam: 21.5 mmString pattern: 16x19String tension: 50-60 lbscurrently both rackets strung with Luxilon Alu Power 125, 50lbs tension