Yasaka Reinforce SI

By sandwiching various carbons just beside the core material, we added repulsive power of special material while having wood control performance. "Lean Force" series that gives player's batting power and stability. SI makes it possible to demonstrate the spherical holding and ease of use like a wood racket at the time of light striking, by bringing the position of the carbon to the center by thinning the core material, and it can demonstrate the power of carbon when blowing.