As an extremely fine thread Semperfli Nano Silk 50D (12/0) is a Gel Spun Polyethylene (GSP) powerhouse that is 10 times stronger than steel for its diameter, making it virtually impossible to break while tying. This minimal-bulk thread is the top choice for professional tiers needing to tie small flies without building up a bulky head, but its strength also makes it perfect for cinching down heavy materials on larger patterns.
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