Sennheiser 561035 Adapter Plug For HD Series Headphones Genuine SENNHEISER Mini-Cable Adapter Female 1/4" (6.3mm) to Male 1/8" (3.5mm) plug. (The adapter is un-marked but made by Sennheiser, Product code: 561035, UPC 615104262560). The adapter-cable converts a large Headphone Stereo plug 1/4" (6.3mm) to a small stereo 1/8" (3.5mm) Male mini-plug Total length including adapters: 9" (230mm). The adapter is designed with high quality components and gold-plated plugs for no degradation of the audio signal Durable design with flexible strain relief eliminates risk of damaging audio components. The extra cable length gives nice flexibility Compatible with most headphones that come with the larter 1/4 inch (6.3mm) connection. Some examples...SENNHEISER HD518 HD555 HD558 HD595 HD598 HD650 HD700 HD800, GRADO 125, 225, 325, RS2, RS1, PS500 GS1000, PS1000, AKG, Audio-Technica, Beyerdynamic, SONY, HiFiMAN and many more Headphones (with 1/4" 6.3mm plug)!