Wilson Blade 104 Tennis Racquet Endorsed by Serena Williams, the larger head size Blade 104 has a more comfortable feel and bigger sweet spot Upgraded with Parallel Drilling to provide a consistent, more forgiving string bed response while dramatically increasing the sweet spot Braided Graphite + Basalt construction improves the flex of the racket which increases the ball's contact with the strings to provide enhanced feel and greater control Power Holes improve power and provides a livelier string bed This racquet comes unstrung and without a cover