Genuine Sennheiser Headphones Extension Audio Cable 3.5mm TRRS M/F AUX Cord 4 FT | eBay
Amazon.com: Geekria QuickFit Audio Cable Compatible with Sennheiser HD 560 S, HD599, HD598, HD 598SE, HD 598CS, HD 598SR, HD579, HD569, HD400 PRO Cable, 2.5mm Jack AUX Replacement Stereo Cord (6 ft /