It is wonderful stuff. We have been using it here since it came out for size 20 flies and smaller. Takes a marker well, not as much stretch as other that fine, and is the same material as 8/0 uni but fewer fibers. Only comes in White right now but like I said takes a marker well. Uni also has 20 denier and that is a fun thread for ubber small flies, it comes in Black & White.

Joe Fox