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Rule the game with the fastest touch from an ultra-thin, razor-sharp frame. A lightweight, swing-speed model. Sonic Flare System TORAYCA® M40X The world standard: ISOMETRIC, born at YONEX. YONEX's original square frame shape, ISOMETRIC, equalizes the lengths of the main and cross strings, creating a sweet spot that is wider vertically and horizontally than a conventional round frame. Born at YONEX, this technology won numerous titles with top players in tennis, and in 1992 it became the world's first to be used in a badminton racket with the ISOMETRIC 500. Since then, it has been loved by countless players as the world standard. - EX-HMG - Aero + Box frame shape - New grommet pattern - Solid Feel Core - NANOMETRIC - New built-in T-joint - Ultra Slim Shaft - Control Support Cap - Vibration Dampening Mesh