AZR aluminum: a complex combination of thermal treatment processes strengthens the alloy for a more responsive, forgiving feel Outer-Locking System createsA the stiffest connection available while dismissing vibrations on contact for the strongest, smoothest swing yet Tightened production tolerances allow barrel diameters to be built to the maximum limit, creating more surface area and higher overall performanceA Multi-variable wall design creates an expanded sweet spot and thinner barrel walls that are more forgiving after off-centered contact Ergonomically designed handle taper for each weight drop allows for better fit, more bat control, and a better overall feel