A great racket for good level players looking for a balance of power and manoeuvrability. Babolat Woofer Technology: The first and most efficient system which makes the frame and strings work together when striking the ball, an incredible 2% longer ball/string contact creating more comfort an better control. Babolat Cortex System: Babolat's Cortex shaft vibration dampening system is created to offer improved comfort throughout play. Available in two variations, the Cortex system used in this racket reduces harmful vibrations without filtering out the feedback required for feel. This filtering of unnecessary vibrations results in what Babolat calls a "pure feel."