The Neumann NDH Coiled Cable (catalogue number 508821) is the genuine replacement spiral headphone cable for Neumann's NDH series studio headphones, including the NDH 20 closed-back model named in this listing. It is supplied with a 6.3 mm (1/4 inch) screw-on adapter, so the headphones can be plugged into both 3.5 mm outputs on laptops and audio interfaces and 6.3 mm outputs on mixing desks, headphone amplifiers and studio equipment. Neumann's NDH 20 data sheet specifies the spiral cable as extending from 1.5 m to 3.0 m and weighing about 100 g; the coiled design keeps the cable short and tidy when the engineer sits close to the desk, but lets it stretch when moving around the control room or recording booth. The cable attaches to a single side of the headphones, entering the right ear cup. A replacement cable is one of the most common spares for studio headphones, because cables are the part most exposed to being stepped on, pulled or twisted. Recording studios, broadcasters, schools and rental companies are typical buyers. The listing is for the cable and adapter only; headphones are not included.