The Cardas extension cable for audiophile headphones offers a typically superb braid design, the best construction materials, and ultra-durable build quality from the upscale cable specialists (and good folks) at Oregon's Cardas Audio. Employing George's 'Golden Ratio' proprietary braiding, shielding and dielectric engineering creates one of the smoothest-sounding, most transparent headphone extension cables available on the audiophile market. 10ft length, Cardas 1/4' terminations.