The proprietary Nickel Boron formulation and a remarkable technology proves that not all Nickel Boron coatings are created equal. WMD has been a pioneer in of Nickel Boron technology in the firearms industry, and not only is our coating formula unique, it is also the application process. NiB coating provides the optimal combination of hardness, wear resistance, lubricity, and corrosion resistance. The Safety Selector, Semi, NiB-XA(R) coating has a hardness of HRc 70