CARDAS AUDIO CROSS Upgrade Headphone Cable fit SENNHEISER HD650 HD660 S HD600 HD580 HD565 HD545 HD535 HD525 HD265 - 3M (9.8ft) cord with 1/4" Plug Cardas Audio Cross Headphone cable is a shielded, lightweight, flexible, 4 conductor design Fit Sennheiser HD/650, HD/660 S, HD/600, HD/580, HD/565, HD/545, HD/535, HD/525, HD/265-Linear Length 9.8ft (3M) with 1/4" (6.3MM) Male stereo plug Developed by George Cardas when his daughter, a radio DJ at the time, kept needing replacement cables for Sennheiser HD600 headphones The result was developing a more durable cable, with greatly improved sound performance