Wilson Juice 100S Spin Effect Tennis Racquet Wilson Spin Effect Technology reduces the number of cross strings to produce more spin without having to change your swing Racquet comes unstrung and a racquet cover is not included The extra spin provided by Spin Effect Technology gives the player 2 additional inches of net clearance and allows the ball to drop quicker, making the court seem 12 inches longer Parallel drilling provides a bigger, more forgiving sweet spot and a livelier string bed Amplifeel 360 reduces harsh vibrations in the handle and adds power Wilson Spin Effect Technology reduces the number of cross strings to produce more spin without having to change your swing The extra spin provided by Spin Effect Technology gives the player 2 additional inches of net clearance and allows the ball to drop quicker, making the court seem 12 inches longer Parallel drilling provides a bigger, more forgiving sweet spot and a livelier string bed Amplifeel 360 reduces harsh vibrations in the handle and adds power