DUORA Yonex Technology:

DUORA rackets are designed to bring radical innovation to your game, letting you command the court with every shot. Every racket in this range features two key technologies: the Dual Optimum System and Nanometric DR.

Dual Optimum System: Every racquet in the DUORA series features two, contrasting racquet profiles, allowing you to hit the right type of shot every time. The Orange Box frame gives you power and a solid feeling, while the Green Aero frame gives you speed and sharp returns.
Nanometric DR: Developed for space aviation, Nanometric DR is a new carbon material, making your racket tougher and giving you more shuttle hold, repulsion and impact strength.