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