Mundorf Pure Silver/Gold Bare Foil, 17mm cross section 1.28 mm2. The mixture of Silver plus 1% Gold has proven itself excellently as capacitor film for the MCap? Supreme Silver/Gold series. The resulting sound is so impressive that it was only natural to think of using this alloy for the internal wiring of electronic devices. Purity and elegance are the terms that automatically lend themselves to this exquisite material.