UTC GSP 75 Thread
Ultra GSP is the strongest thread on the planet. Boasting steel-like strength for its weight, this thread really lets you put the pressure on! The gel spun polyethylete is supple, ties flat and is available in the largest selection of sizes and colors.
75 denier is the ideal choice for all trout flies. It is small enough to tie tiny dry flies and strong enough for the largest trout streamers. It is an excellent all purpose fly tying thread.