Jabba uses La Bella flatwounds. I’m assuming you are talking about @wrinkleygit’s gorgeous bass which, I think, has La Bellas on too (I’m sure he’ll be along to put me right if not). Certainly the bass I’ve just purchased from Jez has La Bellas as did both my Rob Allen basses, I think they are by far the best strings for basses such as Jez and Rob Allen build.