Genuine Kjellberg cathode (electrode) for plasma cutting at 130 A and 160 A. The cathode carries the cutting current and contains the emissive insert from which the plasma arc starts and burns. It is a wear part: as the insert erodes, arc starting and cut quality deteriorate, so it should be replaced at the first signs of pitting or when cut edges begin to bevel or dross increases. Replace it together with the matching nozzle for best results.