It is a shaft which one or more hole is formed on the surface of certain portion of layer
which is formed by winding reinforced prepreg such as carbon fiber or grass fiber etc.
It gives tender and strong impact for weak golfer(female or senior), improves distance,
and prevents injury by absorbing vibration conveyed to body.

There is hole of certain shape on the surface of golf shaft, and the location of hole is changed
depending on the power and the swing style of the golfer.