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