Ensures a stronger, more flexible frame, while the increased flex in the shaft creates maximum power. Combines a solid feel with a swing rapide. ISOMETRICTM technology continues to help the world's greatest players achieve success mondial. Developed over 30 years ago, the ISOMETRICTM design increases the sweetspot by 7%*. Compared to a traditional round frame, an ISOMETRICTM square shaped racquet generates a wider sweetspot by optimizing the intersection of the main and cross strings. ISOMETRICTM offers better control without sacrificing power. ISOMETRICTM is a registered trademark of Yonex CO., LTD. *Tested by Yonex By applying counterbalance theory, weight is distributed to the tip of the grip, the top of the frame and the joint for maximum control. The transition to the next shot can be made smoothly, with a succession rapide. The thinnest racquet ever produced by YONEX dramatically reduces air resistance while providing maximum feel.