Marine Corps First Sergeant Black Finish Pin is the official United States Marine Corps pin for First Sergeants. First Sergeant are senior advisors that are in control to lead medium to large units in the Marine Corps. This is a primary rank and is a big honor to be selected into this position. This black finish pin is an official issue and is ready to be worn on official United States Marine Corps uniforms. This First Sergeant pin measures at ⅞ inches and is made in the USA.