...and then I found Uni NYLON. I ordered a spool of white to sample and soon ordered more in both colors, all in 70 denier. As it comes off the spool, this is a truly flat thread. There is no bulk whatsoever. Give the bobbin a spin to tighten up the thread, and you'll be tying small heads on #16s & #18s. Splits readily for dubbing application. I also like that it's unwaxed. Until UNI releases more colors (ask them!), you can tint the white with marker. Generous spool for the $.