These are the limited edition of the HD580 that was the prototype for the HD600. They are the equivalent of an HD600 sonically and construction-wise, but with a different pattern/color on the headphone. This comes with the original box, documentation, and a 1/4" adapter. The top Sennheiser logo is rubbing off on the headphone as is the lettering on the side of the headband. There is some wear on the underside of the headband. Otherwise these headphones are in beautiful condition. Asking SOLD!. Paypal preferred.