Floatation marker buoy 51 is {HEAD ~ a generally spherically shaped member} made of {TAIL ~ a buoyant material} 
made of
Floatation marker buoy 51 is { HEAD ~ a generally spherically shaped member } made of { TAIL ~ a buoyant material }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL