1."New high speed cavity back" structure that evolved
I evolve "high speed cavity back" design of the most suitable weight distribution,
In being rather heavy, and having placed weight on the toe side more a center of gravity position
I approach the club center more and realize further flying distance and stability.
From rye any in the sole shape making the shape that is flatter than a previous work
I show the good point of the twit who can beat without a hesitation.