The assembly 1, wherein the casing and {TAIL ~ the collars} are made of {HEAD ~ composite material} 
The assembly 1 , wherein the casing and { TAIL ~ the collars } are made of { HEAD ~ composite material }
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD