Replacement cable. Original Sennheiser product in a sealed bag.
This is a double sided 10ft (3m) cable with a straight 1/8 inch (3.5mm) stereo-plug in the end. (And two 2.5mm plugs in the end that connects to the drivers).
The cable fit models: HD212, HD212 Pro, HD477, HD497, eH250, eH350