The particular material used, 7075 aluminum, is {HEAD ~ a readily available alloy} of aluminum, zinc, magnesium, copper and {TAIL ~ chromium} 
The particular material used , 7075 aluminum , is { HEAD ~ a readily available alloy } of aluminum , zinc , magnesium , copper and { TAIL ~ chromium }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL