Please note as of 4/2018: WILWOOD Type III Mil-Spec hard anodizing replaces Type II black anodizing as the standard finish on all base and powder coat finish caliper models. This process produces a thicker, harder surface with a rich, medium-gray appearance. More importantly, it creates a more durable wear surface in the piston bores, with increased resistance to abrasion and corrosion over the entire external surface of the caliper.