{HEAD ~ The wire} has a diameter of from about 0.1 to about 0.5 millimeters and is formed from platinum, {TAIL ~ iridium}, or a platinum/iridium alloy 
{ HEAD ~ The wire } has a diameter of from about 0.1 to about 0.5 millimeters and is formed from platinum , { TAIL ~ iridium } , or a platinum / iridium alloy
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH