Cables.  I go through them sometimes four times a year.  I can't understand why expensive headphones don't have detachable cables.  I have stuck with K240s for years and years.  I've had two Austrian and two Chinese sets.  They are my reference for tracking; my studio is calibrated around these headphones.  This cable is a tremendous upgrade to the one that comes with the headphones: http://www.amazon.com/gp/product/B00KALWHSM/ref=ox_sc_sfl_title_2?ie=UTF8&psc=1&smid=AJ2PJNO98VCDO