This is the next chapter of the Wilson Pro Staff 97L which is a slightly lighter, more powerful version in the Wilson Pro Staff family. In this version, Wilson has changed the balance of the racquet to allow for you to be able to whip through the ball. The unique 18x16 Spin Effect string pattern, making it easier for the player to increase the spin and bend the ball's trajectory. With its groundbreaking carbon layer integrated into the frame, Countervail is a material technology that maximizes a player’s energy, reduces muscle fatigue and shortens recovery time, combined with a new Amplifeel handle system for the best feel yet in a Wilson Pro Staff. The 97sq. inch headsize offers a comfortable feel with a healthy sweetspot. Ideally suited for players with aggressive, long strokes. Recommended for the 4.0+ NTRP level players. Wilson Racquets WRT73921U