The member 12 is made of {HEAD ~ a material} having a low coefficient of thermal expansion and high thermal conductivity, such as sapphire or {TAIL ~ ruby} 
such as
The member 12 is made of { HEAD ~ a material } having a low coefficient of thermal expansion and high thermal conductivity , such as sapphire or { TAIL ~ ruby }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL