Wilson H6 Adult Recreational Tennis Rcket - Grip Size 3 - 4 3/8, Black/Grey Pre-strung; Graphite composition provides excellent mix of control, feel and power with strong construction; C-Matrix Technology creates superior stabilization for a smoother swing Perimeter Weighting ...Wilson H6 Adult Recreational Tennis Rcket - Grip Size 3 - 4 3/8, Black/Grey Pre-strung; Graphite composition provides excellent mix of control, feel and power with strong construction; C-Matrix Technology creates superior stabilization for a smoother swing Perimeter Weighting System improves torsional stability Midsized head provides enhanced feel and control Perforated grip aids moisture absorption Complete with a new design and a new layup, the H6 maintains the lightweight, head-heavy feel that fans of the original Wilson Hammer series cherish, but with more stability and firmness than before. This extra stability is derived from all-new C-Matrix Technology, which adds stiffness to the frame for smoother swings and volleys. Throw in the Perimeter Weighting System for improved torsional stability, and this racket creates a high ceiling for crisp put-aways at the net and an impressive display of power despite its light weight.