Nano Silk Thread: A new hybrid GSP thread that is virtually unbreakable. The strongest fly tying thread available on the market. Not only for small flies, but for ALL types. Now you can easily tie any fly with no build up. Imagine spinning deer hair using a 12/0 thread. It costs more but it’s the BEST! Nano Silk is virtually unbreakable and still capable of being split down for dubbing twists there is no fly tying thread as strong as Nano Silk anywhere! Watch a video about Nano Silk here.