Caliber Frame Frame size & shape that is easy to cope with drive & receive warfare in low altitude intertwining attacks. I-Navi+ (Impact Navigation) Improve shot feeling by relaxing shock at hitting ball. Enable surface stability and energy loss Cross Flexible Frame Unique to Mizuno pursuing every stiffness distribution of frame design. Thumb Assist Cap+ Sharp shape so that the hitting part of the tip point cap increases the fit more. V Rapier Shaft Improved operability and swing by 6.4 mm tapered shaft (tapered shaft). More Fit Grip A material with wet feeling and elongation, a leather shape dented in the center realizes high grip power. HF Regin High speed swing can be realized by HF REGIN Mizuno Green Grade New certification criteria for environmentally conscious products "Mizuno green grade"