The upgraded LC-RE Pro consists of three kinds of wires – Furukawa monocrystalline copper, gold-plated monocrystalline copper, and pure silver. Consists of 20 gold-plated + 20 pure silver + 20 monocrystalline copper wires. It features twist-lock interchange audio plugs, allowing you to freely switch between 3.5mm single-ended/2.5mm balanced/4.4mm balanced plugs depending on your source.