Tennis Racquet of Choice for Serena Williams! This is the Serena Williams Autograph version of the Wilson Blade 104 Countervail Tennis Racquet. This racquet has excellent power to go along with the 104" headsize, making volleys and groundstrokes more forgiving. The 28" length provides a whole extra inch compared to ordinary racquets, and the frame is 8 points head light, making it more maneuverable on compact shots. Amplifeel technology provides enhanced feel without harsh vibrations. Also, the 18x19 string pattern gives it a tightened feel with more control. Ideally suited for players with moderate to aggressive strokes. Recommended for the 4.0+ NTRP level players. Basalt: Basalt is a natural volcanic rock. It can be used in manufacturing where it is made into fine gold fibers with incredible vibration resistance. Wilson's new technology, BLX, has used these basalt fibers and woven them longitudinally with [K]arophite Black to create one of the most advanced composites in the industry. With basalt, a smoother signal reaches the hand. BLX technology delivers clean feedback and better sensation for the Perfect Feel. Double Holes: Bigger holes allowing 26 degrees of string movement for a bigger sweetspot. Amplifeel: Amplifeel handle technology is fine-tuned to each racquet to provide a lean, enhanced feel due to basalt inserts, customized foam, and a softer buttcap. Wilson Racquets WRT73341U