Wilson '13 Blade 104 Tennis Racquet (Unstrung) Endorsed by Serena and Venus Williams, the 104 square inch headsize gives the modern, aggressive player a bigger sweet spot and outstanding power Racquet comes unstrung and a racquet cover is not included The choice of many Next Generation players, the Blade family is the next big thing in the future of control-racquets The tight 18x19 (18 main and 19 cross strings) string pattern gives the player more control and accuracy Amplifeel Technology reduces harsh vibrations in the handle and adds power