Through golf history, shaft stiffness has been defined in simplistic terms of flex and frequency. But, when developing the new SABER — a new line of graphite shafts dedicated to total launch control — Royal Precision engineers turned to a more scientific and comprehensive process known as Energy Inertia ‘E.I.’ Curves, an advanced analysis that has never been applied to an entire line of golf shafts.

In the new process, a golf shaft’s stiffness is measured in one-inch increments along the entire length of the shaft. The data is plotted and compared to the stiffness, feel and flight characteristics of known shafts, and the collected data is compiled into the E.I Curve. With this comparative analysis, Royal Precision shaft designers can predict flight characteristics based on the complete longitudinal stiffness of a golf shaft. Without question, this comprehensive ‘butt-to-tip’ approach of E.I. technology has allowed Royal Precision to introduce Saber golf shafts onto the PGA Tour with initial and immediate success.

That’s cutting edge!