jack : 3.5mm Male & 6.35mm adapter to 2.5mm Male(comes with the lock the same as the Original cable)
Cable Diameter : 4mm,cable material:the inside cable is OFC wire,the outside cable is Braided Tangle-Free cable
it is Compatible with For Sennheiser HD598 / HD558 / HD518 / HD598 Cs / HD599 / HD569 / HD579 Headphones