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Wilson Ultra 100 Countervail Tennis Racket (2017) [Frame Only]The best balance of power and control in the Ultra range. For all-court performance.The Ultra 100 Countervail is the most versatile racket in the Ultra franchise. Featuring Countervail Technology that maximizes player energy and integrated power technologies that get the most boom for your buck, this racket is a game-changer for players of all levels and styles.Re-defining power and versatility, Wilson Ultra is designed to provide overwhelming power with efficient performance. Packed with brand new technology, Wilson Ultra rackets have increased throat stability and stiffness, the new Crush Zone grommet system which boosts power and ball dwell time on the strings and a 15% increase in the racket hotspot in comparison to previous editions, providing players more explosive power than ever before.Countervail - a material technology integrated into the frames of the racket. When making contact with the ball, Countervail directs the ball’s energy within the frame rather than the players arm. This leads to reduced muscle fatigue and recovery time as you spend less energy every swing. Most impressively, the technology - also used by NASA to maximise energy during flight – does not affect the feel, flex and control brought by the braided graphite and basalt in the frame.