The covering 14′″ and 22′″ may be {TAIL ~ a resin} such as {HEAD ~ polypropylene} 
The covering 14′″ and 22′″ may be { TAIL ~ a resin } such as { HEAD ~ polypropylene }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD