Square-shaped ISOMETRIC racquet generates a larger sweet spot by optimizing the intersection of the main and cross strings; Liner Tech System for improved power and comfort. Straight hole grommets elongate the strings to optimize power and comfort on off-center shots; O.P.S (Oval Pressed Shaft) flexes at impact to increase dwell time and minimize vibrations; Shockless Grommets provide a soft feel at impact to protect the wrist, forearm, and elbow by absorbing shock; Aero Shape Design is a tapered frame design with a thinner frame face results in a softer racquet; Dual Shut System improves stroke comfort and control; Made in Japan