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