Co-designed by Roger Federer, the Pro Staff 97L CV delivers the pure classic feel players have come to love but with an all-new uncontaminated design. Roger's personal racquet is now offered with more power, a larger head size and a bigger sweet spot. Now with Countervail technology, an all new material technology integrated into the frame that maximizes a player's energy by reducing muscle fatigue and shortening recovery time. It delivers a clean response for the most advanced players. This model is lighter than the 97 CV model for easier handling.