Headsize100 sq. in Length27 Beam Width23 24 23mm Weight Unstrung310g10.9oz ColorsChromeLimeWhite CompositionConstructionHM6 Carbon, Graphite String PatternMains X Crosses16 x 19 Recommended String Tension55 65 lbs Balance31mm12.2 in Head Light StiffnessFlex68 ra Grommet TechnologyAnti Friction Grommets Frame TechnologyAeroskin, Anatomic Construction, Cx Technology Grip TypeGecko Tac Grip Swing TypeFastLong Manuf. Recommended StringDunlop Silk No CoverThe all new Biomimetic 400 Tour is designed for advanced club level players with mid to long swing styles who require a control oriented frame with good levels of power. The 100 sq. inch TruOval head shape with the 16 x 19 string pattern creates a large sweet spot, makes the racquet more forgiving, more powerful, and offers more access to spin that the 200 and 300 series racquets. The 400 Tour is constructed with premium Aerogel enhanced graphite and features Dunlop's new Biomimetic technologies. Cx Technology in the racquet head creates a more powerful aerodynamic profile. The anti friction grommet system allows more string movement for enhanced power from the string bed. Anatomic construction in the throat, inspired by human bone structure, adds stability and control to the racquet. HM6 Carbon enhances racquet feel, Aeroskin Technology reduces aerodynamic drag making the racquet faster through the air and the Gecko Tac grip gives ultimate control in all conditions.