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