Also, the head pipe is formed at its front surface or its both sides of {HEAD ~ its tubular main body portion} with {TAIL ~ an opening} in order to reduce the weight 
with
Also , the head pipe is formed at its front surface or its both sides of { HEAD ~ its tubular main body portion } with { TAIL ~ an opening } in order to reduce the weight
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH