I've only tried one of these tungsten electrodes and it worked perfectly. 10 pieces in a pack. I want them to last a long time. I couldn't beat the price of the electrode.
Pros
Set of 10 high quality tungsten electrodes for TIG welding with 2.0% thorium. AWS classification: EW-Th2 (red). Conforms to ANSI/AWS A5.12M/A5.12:2009 ISO 6848:2004 MOD.