{TAIL ~ The end conical portion} has a cone half angle of from {HEAD ~ about 5 to about 10 degrees} 
{ TAIL ~ The end conical portion } has a cone half angle of from { HEAD ~ about 5 to about 10 degrees }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD