a bonding material joins the shell and the metallic sleeve, the bonding material including {HEAD ~ an ETFE powder} and {TAIL ~ an elastomer} 
a bonding material joins the shell and the metallic sleeve , the bonding material including { HEAD ~ an ETFE powder } and { TAIL ~ an elastomer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL