Grado offers a 365cm extension cable terminated with a 1/4 inch 6.35mm plug and a 1/4 inch 6.35mm jack. This cable is constructed from the same high quality wire as their headphone cable, and contains 12 conductors. For longer lengths the cable may be piggybacked up to 3 cables. Grado guarantees no degradation of sonic quality with Grado headphones while using their extension cable.