Selling my basically mint pair of OK-1 never really used it much cosmetically and functionally perfect.They mainly just sat there and did not get any use, still needs the burn in time. I have all original tips & box. Sale will include shipping for US and Canada plus paypla fees. These are very impressive more so than the PK1, and you can get a basically brand new pair cheap compared to the full price of over $200. Thanks for looking!