Muscle power frame - mp frame construction creates total unity of the string and frame through closer and tighter contact this locates the string on rounded archways that eliminate stress-load and fatigue through contact friction isometric head bigger sweet spot built-in t-joint - the lightweight t-joint increases stability of the shuttle on the strings, maximizing power and control. new grommet pattern - single pass grommet holes for reduced string stress, maximizing performance control support cap - sharp maneuverability