This is the version of the U.S. flag that flew over Fort McHenry when Francis Scott Key wrote "The Star Spangled Banner."ï¿½ï¿½ All of our Historical Flags are acid dyed for unsurpassed brilliance, elegance and craftsmanship. The high tenacity NYLON fiber provides superior resistance to damaging heat, wind, rain and ultraviolet sun radiation. As a result, this enhanced polymer technology is far superior to other flag fabrics. Each flag is 100% AMERICAN MADE and has a canvas header and brass grommets. Individually boxed.