Semperfli Nano Silk is a premium fly tying thread made from gel-spun polyethylene (GSP), it's widely regarded among fly tiers as one of the best threads you can use.
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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