It is used in Kala U bass and made of polyurethane.
http://www.bassuke.com/Pahoehoe.html
Sound of Kala U bass with Phoehoe string?
http://www.youtube.com/watch?v=vNPx6RS8PiM
The link says;
Individual strings will be made available at a later date and will sold by the inch for custom applications including 5 string or alternate tunings.
String gauge is way too big for average 34" E bass, but some filing to nut will do it.
Anyone interested?
