Amazon.com: Linkidea Headphones Carrying Case Compatible with Sennheiser PXC 550, PXC 550 II, PX90, PX360, HD239, HD229, HD228, HD220 Case, Protective Hard Shell Travel Bag with Cable, Charger Storage (Black) : Electronics
Amazon.com: Cubilux 3.5mm to 2.5mm Headphone Cable with MIC Compatible with Bose QuietComfort 45/35/25 Noise Cancelling 700, Sennheiser PXC 550/480, JBL Tune 760/750/720BT/710/700/660/600 Live 660/650/500, 4 FT : Electronics
NEW!! Nylon Audio Cable with mic For Sennheiser PXC550 PXC 550-II Headphones | eBay
2.5mm to USB Type C Braided OFC Cable Extension Cord Wire for Sennheiser PXC550 PXC480