{TAIL ~ The tungsten carbide} can be essentially any type as long as the particle size is {HEAD ~ less than about 1 micrometer} in mean diameter 
{ TAIL ~ The tungsten carbide } can be essentially any type as long as the particle size is { HEAD ~ less than about 1 micrometer } in mean diameter
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH