Semperfli, developers of Nano Silk, one of the strongest and best regarded technical threads for fly tying have applied their skills to classic waxed Polyester threads. Using the similar manufacturing techniques as with Nano Silk, we extruded thin polyester strands. Twisting the strands lightly enables it to both lay flat and split easier than other threads on the market. Having reviewed the market standard 8/0 and 6/0 threads, we added a new waxed 12/0 thread for fine dry flies and European nymphs and buzzers / chironomids.  Semperfli has extended the capabilities of the fly tyer even further. Use with any type of bobbin.