About this item Replacement audio upgrade HIFI cable compatible with select headphones extension cords. Length: 4.2 x 3.5 x 0.4 inches, package includes: 1 replacement cable (no headphones included). Cable diameter: 4mm, cable material: the inside cable is OFC wire, the outside cable is braided tangle-free cable. Connector: 3.5mm male & 6.35mm adapter to 2.5mm male (comes with a lock similar to the original cable). The 2.5mm male on this cable is compatible with specific headphone models. Size description: 4.2 x 3.5 x 0.4 inches.