New for 2009!!!  New Musclepower series replaces the old Isometric Line.  

MUSCLE POWER 5 FEATURES:

MUSCLE POWER: Muscle Power seats the string on rounded archways that eliminate stress-load and fatigue through contact friction. The construction creates total unity of the string and frame through closer-and-tighter contact.

ISOMETRIC: The Isometric Square Head Shape equalizes the length of main and cross strings in the stringbed, enlarging the sweetspot for more consistent accuracy even on off-center hits.

BUILT IN T-JOINT: Moulded deep into the layers of graphite where the frame connects with the shaft, the Yonex built-in T-Joint creates a durable and high-strength one-piece frame that is torque-free.

   *      Flex: Medium
   *      Frame Composition: Aluminum
   *      Shaft Composition: Graphite
   *      Weight: 2U (90-94.9g)
   *      Grip Size: G4
   *      Bag: Frame Racket Cover