ZU CABLE Mobius mk2 replacement headphone cable for Sennheiser HD600 HD650 HD560, 2.5m. New retail price: 56,700 yen (2.5m/tax included) The HD600 has a great sound, but some say the response is a bit slow. Replacing the cable with this silver cable improves the high frequencies and sound response, increasing the sound resolution. Related articles: https://www.phileweb.com/sp/news/audio/200704/19/7167.html https://av.watch.impress.co.jp/docs/20070425/pacific.htm 6.3mm standard phone jack. A separate conversion plug is required (not included) if you want to use it with 3.5mm. Cable only. The plug is slightly tarnished, but I think it will be fine with cleaning. There may be other oversights, but I am selling it cheaply, so please bid with the understanding that it is used and no returns or claims are accepted.