Specially formulated Gel Spun Polyethylene 100D 6/0 Nano Silk is regarded as the tying thread of choice of fly tyers worldwide. This is ideal for saltwater, Pike, Relative Muskie, Tarpon and all large predator flies. Recommended hook size guide #10 to 2/0 and above strong and will flair deer hair with ease. Virtually unbreakable and still capable of being split down for dubbing twists. There is no fly-tying thread as strong as Nano Silk anywhere. Because Nano Silk lays perfectly flay you get no thread build up.