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UNI Products BigFly Thread
Designed for tying monster-sized flies for fresh- or saltwater, UNI Big Fly Thread is made of continuous polyester filaments. Although it's 4 times as thick, and 4 times as strong, as UNI's 6/0 thread, Big Fly is surprisingly easy to work with; it untwists easily and lays down tight and flat as needed, yet despite its strength it will not dull your fly tying scissors. 400 denier.