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Ultra GSP Thread



Gel spun polyetheline is supple, ties flat and is the strongest thread per diamter known to man! Sold here in 50, 100 and 200 denier.

In Stock
ultra gsp fly tying thread
Ultra GSP is the strongest thread on the planet. Boasting steel-like strength for it's weight, this thread really lets you put the pressure on! Gel Spun Polyethylene is supple, ties flat and is available in three sizes. 

Choose 50 denier GSP for tying small trout flies with a minimum of bulk. GSP 100 has all around versatility for fresh and saltwater flies and GSP 200 is the size to choose for big deer hair work or when you really need to crank down!  Breaking strength on these threads is 4lbs, 8 lbs and 16lbs.

Sold here in white- if you need a colored thread for a head- use another thread to finish over top!

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