Massdrop x Sennheiser HD 6XX headphones. Like new. Had a very short while (a few weeks) and purchased Beyerdynamic DT 1990. HD 6XX has been stored in its case and box for a year or so, since that time. Included will be the 6XX, stock cable and custom Corpse Cable (Mogami) cable, which was $155. Also included unopened owners manual, original case and original box. Everything in excellent shape. Very few hours of gentle use.