The Stitcher's Muse out of Nanaimo, BC. No affiliation, etc. - just a happy customer. These are a thicker thread, nonstrandable and similar to Kreinik braids in weight. They are so easy to stitch with! I have been using them on seamwork on the little AAQI quilts and they are great to work with - very little fraying and no tangling. I've used them for french knots and think they would work fine for bullions too since they handle so nicely.
I couldn't figure out the name of the thread to tell you but I finally clued in and looked on The Stitcher's Muse website and it is called Sparkle.