these are cloth wrapped cables. They are quite common you can find then on line at places like Musiciansfriend. Fender even make a similar style called vintage electrovolt cables.

Personally, when I want really nice cable I use Mogami. I switched from Monster as they are not what they used to be. I ordered half a dozen Monster 100 18" cables the other day they turned up and they had these ****ty sealed up molded ends !! Baaa !

Anyway Mogami are my favorites at the moment. Not that cheap but very nice.