The Extreme MicroGel Pro has all the benefits of the Extreme in a heavier, stiffer version, for extremely aggressive hitters. Ivan Ljubicic's weapon of choice. MicroGel is injected between carbon layers, creating a unique new composite. Headsize 100 sq.in Length 27 in Beam Width 242623 mm Weight Unstrung 315g11.1 oz CompositionConstruction MicroGelGraphite String PatternMains X Crosses 16x19 Recommended String Tension 52 62lbs Frame Technology Microgel Technology Color YellowBlackWhite Grip Type HydroSorb White Swing Type L3 Manuf. Recommended String Head Sonic Pro Misc Aggressive, competeive players with a long fast swing speed.