These were previously the legendary Ungar PL133 tips. Tellurium copper alloy with multiple cladding layers. Accept no substitutes for high temp irons. Make sure to use copper anti-seize compound and non-abrasive tinning such as sal ammoniac.
THIS WAS A GREAT FIND ON EBAY. I HAVE BEEN LOOKING FOR THESE FOR A LONG TIME. THESE TIPS WORK GREAT ON THE 50 WATT ELEMENT THAT I USE IN MY HOBBIES. WILL MOST LIKELY BUY MORE.