New for 2013!!! New Musclepower series replaces the old Isometric Line.
MUSCLE POWER 2 JR. 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: Stiff
* Frame Composition: Aluminum
* Shaft Composition: Steel
* Weight: 2U (90-94.9g)
* Grip Size: G5
* Bag: Frame Racket Cover