HEAD Extreme MP: The new Auxetic construction within the racquet yoke maintains impressive stability at contact, and it provides ideal feel to help fine tune your game. The 23/26/21 millimeter cross section provides impressive stability and power, even when hitting outside the traditional sweet spot. With this version, the string pattern has been narrowed slighty to increase control and string durability. HEAD altered the balance of this model to be more head light than the previous version, the result is a racquet that swings faster through the air for impressive spin, and power.