Based on wire material, the classification of dies are (FIG C4) Cemented carbide including Tungsten carbide (WC), Diamond single crystal natural (SCN) including single crystal synthetic(SCS) and polycrystalline(PCD), Ceramic including titanium carbide(TIC), titanium nitride(TIN) and cubic boron nitride(CBN).http://www.natust.com/drawing-....die/wire-drawing-die