1. Connector: 3.5mm Stereo male plug suitable for HD650, HD600, HD580, HD660s, HD58x. 2. Cable diameter: Main cable with 16 cores has a diameter of 4.8mm, branch cable connecting to headphones has a diameter of 3mm. 3. Connector housing material: Carbon fiber/aluminum alloy with black oxidation finish + brass gold-plating. 4. Cable length options: 1.5 Meters/5ft, 2 Meters/6.5ft, 3 Meters/10ft. 5. This replacement cable features a 4.4mm Balanced male jack, Compatible with Sennheiser HD650, HD600, HD580, HD660S, HD58X, Massdrop HD6XX, HD525, HD535, HD545, HD565, HD265 headphones. 6. High Purity OFC Silver Plated Copper provides clear sound, with added protection layer to eliminate noise interference, allowing you to enjoy unparalleled HiFi sound while preserving the original sound quality of your headphones and extension cable.