0.3% Zirconiated (Brown) Ewzr-1 (Principle Oxide: 0.3% Zirconium Oxide). Best For Alternating Current (Nc) For Aluminum Alloys And Magnesium Alloys Using Inverter Or Transformer Based Constant Current Power Sources. Retains Balled Tip During Welding And Has A High Resistance To Contamination. Best Arc Starts, Stability And Less Spitting Than Pure.