Wireworld Helicon16 OCC Copper Speaker Cables Constructed to the same design as the OFC Helicon 16, this cable features the highest-grade Ohno-Continuous Cast 7N copper conductors, offering an extraordinary sound quality that's especially suitable for speakers, and an accessible price point for those in search of superior OCC-7N copper shielded in a slender, flexible package. It's been woven into a Double-Helix DNA pattern and is not recommended for in-wall applications.