NRG-Y2 AC cables use Long-Grain-Copper (LGC) in a 7-strand Semi-Solid Concentric arrangement in which the strands never change position within the bundle. This technique signicantly reduces strand interaction distortion. The higher purity and fewer grains within LGC copper further reduce distortion. Direction-Controlled Conductors & Silver-Plated Shield Drains: All drawn metal has a non-symmetrical, and therefore directional, grain structure. AudioQuest controls the resulting RF impedance variation so that noise drains away from where it will cause distortion. The Silver-Plated shield drains efficiently remove RF noise from the line and neutral shields via the wall plug’s “ground” pin – which is why even the 2-Pole “2” models have an unexpected ground pin.