Pretty sure they meant Depleted Uranium by DU. http://en.wikipedia.org/wiki/Depleted_uranium http://en.wikipedia.org/wiki/Depleted_uranium Has a lower density

Pretty sure they meant Depleted Uranium by DU. http://en.wikipedia.org/wiki/Depleted_uranium http://en.wikipedia.org/wiki/Depleted_uranium Has a lower density than Tungsten, though so would make a poor counterfeiting material in both cost and physical properties.