Unleash the power of sweet with Yonex EZone Ace Tennis Racket. Created by Yonex in 1980, the Isometric head shape is a unique and evolutionary breakthrough technology in racquet design. In conventional racquets, the sweet spot is located where main strings and cross strings meet. The Yonex Isometric head shape allows us to increase the number of main and cross strings that meet in the centre of the racquet to produce a sweet spot which gives a 7% more effective hitting area for you to make match winning shots. Aero Shape - Smoother contours throughout the racquet head for less wind resistance and extra racquet speed. Yonex integrates Shockless Grommets at the side and bottom of the frame to minimize muscle fatigue during long matches. Provides a soft feel at impact plus the ability to protect the wrist, forearm and elbow by absorbing shock. Yonex O.P.S. (Oval Pressed Shaft) manufacturing technology builds the ideal amount of shaft flex at impact into the racquet, extending dwell time for enhanced ball spin and directional control. Dual Shut System improves comfort and control with every stroke. Shockless Grommets at the bottom of the frame reduces impact vibration and Quake Shut Gel, which is embedded inside the grip, removes even the most subtle discomfort from the frame. A 50% reduction in vibration compared to conventional models. By carefully designing the alignment position of the grommets (the parts protecting the strings) and precisely designing the orientation of the strings and the grommets, the noise vibration is greatly reduced, resulting in unmatched comfort.