Cable upgrade for various IEMs. Made to order - can be configured to work with custom IEMs from Unique Melody, Ultimate Ears, Westone, 1964 Ears, etc. Can also be configured for Sennheiser IE8 and possibly other brands/models (you have to ask).
See above for complete review. In summary - If you believe in cables improving your sound, this might be one to check out. Even if you don't, this cable has exceptional build quality and functionality to go with its good looks.