Kumpoo high tension series apply slim outer groove to 3.0mm compare with normal 5.5mm. By extreme slim groove, the series disperses fine balanced side forces. Conditioned by same variances which may affect the maximum tension, the technology maximizes the stringbed stiffness. The series uses same frame as best well-known Kumpoo Power Shot Nano Hexagon 2300II, which ensures excellent hitting power. The maximum tension of this series could be up to 40lb. This racket is splendid and comfortable for all-round chasers.