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