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