1, Cable diameter: The diameter of the main body cable is 5mm, and the diameter of the branch cable connected to the earphone is 3.2mm. 2, Connector: 4.4mm Balanced Male to the Jacks for HD650, HD600, HD580, HD660S, HD58X, Massdrop HD6XX Headphone 3, The connectors shell are made of the walnut wood / Solid Wood - Walnut + Brass Gold Plated 4, Replacement audio Upgrade cable with 4.4mm Balanced Male Walnut Wood Shell 7N OCC copper Single Crystal Silver Plated Cord 4.4mm Balanced Cable Compatible with Sennheiser HD650, HD600, HD580, HD660S, HD660S2, HD58X, HD565, HD545, HD535, HD525, Massdrop HD6XX headphones, Extension Cords 5, The 7N OCC copper Single Crystal Silver Plated wires provide clear sound, and a protective layer is added to eliminate noise interference problems, you will enjoy matchless HiFi sound and maintain original sound quality of your headphone, Extension Cords 6, Package include:1*replacement audio cable