CK T187GTM LaYZr Tungsten Electrode 1/8" x 7", 10 packNon Radioactive. Best for automated or robotic applications in alternating current (a c) or direct current (d c) due to low voltage tolerance (changes in tip to work piece distance) using inverter or transformer based constant current power sources. Good for low alloyed steels, Non corroding steels, aluminum alloys, magnesium alloys, titanium alloys, nickel alloys, copper alloys. very stable tip geometry, runs cooler than 2% thoriated with longer