(Listing on behalf of a friend who has now moved overseas - so please excuse my limited knowledge of this stuff)
Available for sale is the Shunyata Black Mamba power cable. According to my buddy, this was best of all Shunyata power cables he had purchased to date. Over the years, he had simplified his system and got rid of all other cables, but still held on this. It makes a hissing sound as you move the cable (which I was told relates to damping). It's incredibly thick - over an inch thick?
Please message me if you have any questions.
Only other information I know is that he purchased it just over 16 years back and that it's about 6 feet (2 meters?) in length. Lastly, he said he paid nearly $700 or $800 for it back then.