Description FrameAluminum ShaftSteel Weight / GripU (105g and below) G4 Stringing Advice U: 16 - 20 lbs DURA-Frame Solid Feeling DURA-Frame is installed on the frame of YONEX aluminium racquets. This makes the racquet highly durable and provides solid feeling and face stability. MEGA Frame Larger Sweet Spot Due to its unique large-frame design, the Mega Frame further enlarges the already large sweet spot provided by the Isometric. Compared with an ordinary racquet, the Mega Frame provides a 34% larger sweet spot for greater reach and more effective off-centre hits.