This unique feature is designed to give you more spin, control and feel for the ball. The narrow shaft flexes on impact, minimizing shock to the arm and increasing dwell time, or the amount of time the ball is in contact with the string bed.
Quad Power System
By combining the new Quad Power System with Yonex's unique Isometric head design, EZONE provides an exceptionally stable frame and enlarged sweetspot - creating an 'Explosive Zone' in the stringbed that enhances your natural power.
A new material which absorbs impact shock and reduces vibration - is inserted into all four corners of the racquet. Disruptive vibrations within the racquet head are then reduced by 15%.
Yonex EZONE Xi Junior 26 Racquet - Where to go from here