Frequency is defined simply as a method of dynamically determining the stiffness feel of a golf shaft. The frequency of a shaft is measured in vibration cycles as a function of time. For a raw/uncut shaft the butt end is secured in a clamp. A prescribed weight is attached to the tip end. By pulling the weight down and releasing, a meter calculates cycles per minute(CPM). When building a set of frequency matched clubs then shafts with the same CPM readings are selected.