Flex:.. Medium....... Frame:.. Graphite....... gForce Ti....... Shaft:.. H.M. Graphite....... The Power Armor System uses an advanced hybrid material to enhance the racquet frame's 'acceleration of gravity' - thereby generating 4% more speed, improved face stability and providing a robust, metallic feel on impact........ The lightweight frame and distinctive cross sectional shape at the top of the head reduces torque performance, improving both speed and control........ MEGA G2 (Girder Groves) Frame The top right and left sections of the frame are constructed to resemble the cross sectional shape of the grooves of a girder, increasing frame stability........