FireBird ZERO Speaker Cable 10' PairFIREBIRD CONDUCTORS: SOLID PERFECT SURFACE SILVER (PSS) AND SOLID PERFECT SURFACE COPPER+ (PSC+) Solid conductors prevent electrical strand to strand interaction, major sources of distortion. Surface quality is critical because a conductor can be considered as a rail guide for both the fields within a conductor, and for the magnetic fields that extend outside the conductor. The astonishingly smooth and pure surface of all AudioQuests Perfect Surface