Wilson 2016 Pro Staff 97S STRUNG Tennis Racquet - Gregor Dimitrov endorsed (4-3/8) Advanced Player Spin Racquet. Endorsed by world #16 - Gregor Dimitrov Similar to the RF97 used by Federer, but an ounce lighter 97 head, 12.0 ounces strung,even balance, 18 x 17 pattern Quality Wilson string or contact us for choice