{TAIL ~ The mandrel} is preferably formed of {HEAD ~ a rigid, foamed plastics material} such as a structural foam 
{ TAIL ~ The mandrel } is preferably formed of { HEAD ~ a rigid , foamed plastics material } such as a structural foam
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH