It's called Glide and it's getting rave reviews from the professional long armers. It's a non stretch poly that shines like rayon. I got a sample spool of the Glide and two free sample bobbins of Bobbin Line made by the same company. I started free motion quilting a project to try it out and and no breaks, snags, tangles or any problem at all. The look of the thread is so nice in the quilting stitch. It's awesome.
http://www.bobbincentral.com/