Yonex EZONE Ai Feel Tennis Racquet The new Yonex Ezone Ai Feel combines a lightweight frame with innovative power and comfort features to produce a solid, playable stick for beginner to intermediate level players and juniors graduating to their first adult-size racquet. The Ezone Ai Feel sports several new technologies to improve comfort and racquet speed. MAX SWEET SPOT TECHNOLOGY:- Yonex evolved our Isometric Technology with an improved grommet system, applying both deep and shallow grooves inside of the frame. This New Isometric technology provides the EZone Ai with a maximum sweet spot. NEW OPS TECHNOLOGY:- Yonex O.P.S. (Oval Pressed Shaft) manufacturing technology introduces rounder shaft corners providing an ideal level of flex, whilst a wider shaft face increases stability resulting in extended ball dwell time for optimized ball spin and directional control.