One example of {TAIL ~ such a material} is urethane, including polyurethane resin, {HEAD ~ polyurethane rubber}, and combinations thereof 
One example of { TAIL ~ such a material } is urethane , including polyurethane resin , { HEAD ~ polyurethane rubber } , and combinations thereof
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH