Knottable Steel Leader. This very smooth leader material can be used in many way's for you as fly fisher and fly tier, first for using it as a wire to protect your line from de teeth of many predator's. Also great material to connect shanks to your hook, or other connections in your streamers. This spool contains 5 meter of material en can stand 20 kilo of power. Durable for many fish species and perfect for fly fishing for pike.