Ultra GSP thread has steel-like strength.
This thread really lets you put the pressure on!
GSP (gel spun polyethylene) is supple, ties flat and is available in a large selection colors and 2 sizes - 100 denier and 200 denier.
GSP has all around versatility for fresh and saltwater flies. It is an excellent thread for saltwater flies, streamers and our favorite pick for any deer hair work.
2 sizes available, 200 denier is stronger.