They are a pretty thick normal looking black cable... 14awg and shielded... I would stick with a nice 16awg shielded cable for your dac/source but it could not hurt to use on an amp. I have thried quite a few DIY and aftermarket cables and really like these a lot. You cant go wrong, especially for the price.
Philodox - I have an extra laying around if you would like it, that goes for anyone... just shoot me a PM.