Flex Power Duo 101 has a similar design as the yonex duoura 101. The racket was developed with box system frame which gives it a solid feel at impact. With its light body, enable you to move it like a sword and to give a very clean and sharp execution. The racket is a medium flex racket that will give more power as it will have a kind of sling shot effect. This racket is very well balanced and awesome to play with. Special features isomectric head frameequalizes the length of main and cross strings in the stringbed, enlarging the sweet-spot for more consistent accuracy even on off-center hits. Box framebox-shape frame creates an unique and solid feeling. Great for players who seek a solid feel from the strings at impact. High modulus graphite lightweight and strong, the material give strength and perseverance to the racket. It holds large amount of energy at impact, and releases it back like an arrow. It gives you depth and control in your game. High tension frame with the hi-tension frame the maximum horizontal string tension is 33lbs and vertical string tension is 30lbs.