Yonex VCORE Duel G 100 Tennis Racquet - Stan Wawrinka Ball-crushing Technology never lose speed and power even after the bounce. The ball-crushing VCORE duel g will completely transform your game. Ball height after bounce: 14% up spin: 8% up Lock Booster System: the new System on the grommets has more holes towards the top of the frame as well as the grooves to lock the String, crushing the ball and producing more spin Tough g fiber: tough g fiber is incorporated into the shaft. 3 times more flexible than carbon nanotube, tough g fiber provides high repulsion for a heavier and powerful spin Head size: 100 sq. In. Weight: g 300Grams/10.6oz length: 27 in. Material: H.M. Graphite, black micro core, tough g fiber Width range: 20.0mm/21.0mm/21.0mm balance point: hg: 320mm, g 335mm recommended String: Ptgg125, Ptgf125, atg850p stringing pattern: 16/20 stringing advice: 45-60lbs made in Japan