This is Dan Clark Audio’s electrostatic headphone cable.
Unlike traditional flat ribbon electrostatic cables that are heavy and inconvenient, the VOCE cable is round, lightweight, supple and very non-microphonic (no self-noise). The connector is made from machined Teflon, with machined OFC gold plated copper pins, and the cable is a fully custom design, using silver-plated conductors for optimal sound. Cables may be replaced by the owner in minutes.