About this item Replacement audio upgrade HIFI cable compatible with HD4.40 / HD4.40 BT / HD4.50 / HD4.50 BTNC / HD4.30i / HD4.30G / HD400S headphones. Length: 1.2 meters (4 ft), package includes: 1 replacement cable (headphones not included). Cable diameter: 4mm, cable material: the inside cable is OFC wire, and the outside cable is braided tangle-free cable. Jack: 3.5mm male & 6.35mm adapter to 2.5mm male (comes with the lock the same as the original cable). The 2.5mm end on this cable is only compatible with HD4.40 / HD4.40 BT / HD4.50 / HD4.50 BTNC / HD4.30i / HD4.30G / HD400S headphones. Size: 3.94 x 1.18 x 0.39 inches.