2% Ceriated (Gray) Ewce-2 (Principle Oxide: 1.8-2.2% Cerium Oxide). Best For Use In Alternating Current (A/C) Or Direct Current (D/C) Applications Using Inverter Or Transformer Based Constant Current Power Sources. Good Ignition And Re-Ignition Properties, Long Service Life, Excellent Arc Stability. Low Erosion Rate, Best At Low Amperage Range, No Spitting, Good D/C Arc Starts And Stability. Good For Low-Alloyed Steels Non Corroding Steels Aluminum Alloys, Magnesium Alloys, Titanium Alloys, Nickel Alloys, Copper Alloys.