Replacement Audio upgrade Cable Compatible with Sennheiser HD650, HD600, HD580, HD58X, HD660S, HD660S2, Massdrop HD6XX headphones Extension Cords its Cable Diameter is 4mm（After the bifurcation 3mm),its cable material is made with the OFC wire inside & made with the Braided Tangle-Free cable outside. length:120cm/4ft, package include:1*replacement cable(the headphone is not included) Its jack is 3.5mm Male & 6.35mm adapter to the jack fit HD650 HD600 HD580 Headphones It is Compatible with Sennheiser HD650, HD600, HD580, HD58X, HD660S, HD660S2, Massdrop HD6XX headphones