The thickness of {HEAD ~ the thick walled portion} is set to be {TAIL ~ about 1.4 to 1.6 times the thickness} of the thin walled portion 
The thickness of { HEAD ~ the thick walled portion } is set to be { TAIL ~ about 1.4 to 1.6 times the thickness } of the thin walled portion
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH