OFC line: OxidantFreeCopper, meaning oxygen-free copper. Unmatched wiring material for audio products that have been successfully gold plated directly without magnetic nickel plating on OFC (Oxygen Free Copper Wire). The outer circumference is fluorine processed. Uses gold-plated OFC (oxygen-free copper) wire with excellent sound quality. Adopts high pressure and high heat resistance fluorine resin (PFA) coating [Rated voltage 600 V, maximum operating temperature 250 °C]; Fluorine resin (PFA) is low dielectric rate [2.1 or lower / 60 Hz]