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Semperli Spyder Fly Tying Thread, a colour-fast, semi-translucent two twist polyester based thread, is one of the thinnest standard fly tying threads on the market, the same diameter as Spiderweb thread (30D) and Nano Silk Ultra 18/0 (30D). Semperli Spyder Fly Tying Thread is very easy to tie with, not slippy like Dyneema. It is very strong for it's 18/0 30 denier size. Despite the strength of Nano Silk and its ability to lie flat and disappear on small and micro flies some tyers prefer traditional material for their fly tying thread.