Provides a stronger and more flexible frame, while the increased bend of the shaft generates maximum power. Combines a solid hitting feel with a fast swing. The ISOMETRICTM technology continues to help the best players in the world succeed. The ISOMETRICTM design, developed over 30 years ago, enlarges the sweet spot by 7%. Compared to a conventional round frame, a square-shaped ISOMETRICTM racket creates a larger sweet spot by optimizing the intersection of main and cross strings. ISOMETRICTM offers better control without sacrificing power. ISOMETRICTM is a registered trademark of Yonex CO., LTD. By applying the counterbalance theory, weight is distributed to the grip end, the top of the frame, and the joint to achieve maximum control. The transition to the next shot can be seamless and quick. The thinnest racket ever made by Yonex significantly reduces air resistance while providing maximum feel.