Golf shafts aren’t perfectly straight or perfectly round. Studies have shown that irregularities in a shaft’s structure cause off-line bending and twisting during the golf swing. This causes an increase in shot dispersion or, in irons, inconsistent performance from club to club. The SST PURE® Shaft Alignment System analyzes the structure of any golf shaft and identifies its most stable bending plane, or Neutral-Axis™. When assembled in the clubhead in this SST PUREd® orientation, the result is improved consistency from club to club within your set and set to set within your brand.