Silver-Plated Copper Double Shield, a dual-shield construction that uses silver-plated copper (typically braid, or foil + braid with SPC) to enhance high-frequency conductivity and corrosion resistance.
Silver plating increases surface conductivity (beneficial at high frequencies due to the skin effect) and resists oxidation, supporting low loss and long-term stability in harsh or high-temperature environments. Windy City Wire’s 2S designation indicates two shields implemented with silver-plated copper in the shield system (e.g., double SPC braid, or foil + SPC braid).