No idea, but this string is a sleeper, til you find it's sweet spot.
I've done a gig with it and a few sessions with it. This is a killer string! Very live, med-darkish, and loud. It no longer feels dead and every time I hit the E it's like sitting in a bath of sound. The bass resonates like crazy.
It seems that the key is to raise it up high to where it's got room to vibrate freely with as much tension as you can handle. Subjectively, it's like you can feel the entire fundamental of the string - just like you would if you were playing it arco. Once you're past a certain height and tension it really opens up. Before that, it feels a bit dead and restrained.
With this type of setup they start to remind me of Animas, but without the "hollow" attack that Animas have. I dont' know how to describe that sound. I think it comes from the roundwound'ish wrap on the Animas.
I'm up for selling a bunch of strings now that I found what I can do with this one. Ironic thing is that it's been sitting in my string closet for 6-7 years til I rediscovered it. Yeah, better than Spiros, evahs, and all else I've owned. The sound is consistent and even across all strings and registers.
This also reinforces my belief that any particular string needs to right amount of tension to get the most out of it, as well as the bass.
I wouldn't recommend it for those looking for low string height and low tension, and probably low tensioned basses. Sorry if I'm inventing a new term. Example: I can't string up Spiros meds on my bass - even at a low string height it's very difficult to play due to the tension after having a new soundpost put in last year.
It seems more suited for those Noamp setup and want that psuedo-gut sound and basses where there is already intrinsically "more" tension. You want that loud acoustic volume and have some of the technique to get it out. Makes me think that any bass I own I'd like to have it set up where the bass is more tense itself so I can use strings like this more effectively.
I'll post a recording soon.