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Wapsi UTC Gel Spun 75 Denier GSP Thread

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Ultra GSP is the strongest fly tying thread on the planet. Boasting a steel like strength for its weight, this thread really lets you put the pressure on! Our gel spun polyethylene is supple, ties flat and is available in the largest selection of sizes and colors. GSP 75 has all around versatility for fresh and saltwater flies.