GOSEN CUSTOMEDGE PS FLEX-R 4U6 Tapered Flex Shape By tapering the frame from near the sweet spot towards the top, a kick point is set in the frame. This creates further flex, increasing swing-through efficiency and smash power. Weight Balancer Custom parts that can be attached to any location on the frame. Swing weight can be changed depending on the attachment position. Top of frame → Head-heavy Bottom of frame → Even balance Shark Skin 3D Decal Special 3D decals are placed on the 3-4 and 9-8 o'clock portions of the frame. The effect of the shark skin design, which reduces air resistance, improves swing efficiency. NO. 22221