Another version of the Muscle Power line is the Yonex Muscle Power 33 light. By positioning the string on the rounded archways, Muscle Power 33 Light reduces stress load and fatigue through contact friction. Through closer and tighter contact, this structure provides complete unity between the string and frame. The Muscle Power series blends the frame with the string unlike any other thanks to its distinctive frame design. The series is made for gamers that seek out fluid power and quick mobility.