This is an ultra-fine, 20 Denier Gel Spun Polyethylene (GSP) fly tying thread, recognized as one of the world's slimmest and strongest in its class. It is the premier professional choice for micro-flies in sizes #20 down to #32 (Tricos and midges).
Because of its composition, the Nano Silk Pro flattens completely on the hook shank, virtually eliminating bulk—even after multiple wraps—making it indispensable for creating perfectly proportioned bodies and heads on the tiniest patterns.
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