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