The Acoustic Research (AR) Pro Series II , is a line of high-quality interconnects . Featuring oxygen-free copper (OFC), gold-plated connectors, multi-shielding (foil/braid), and nitrogen-injected dielectric, designed for premium Audio / home theater setups with specs like 75 Ohm impedance . Key features included solid OFC conductors, 24K gold plating, and robust shielding for clarity .