A new product for toothy fish. The Nickel-Titanium material is very elastic with 10% to 15% stretch, is kink resistant, and incredibly straight, as well as corrosion free. Standard knots such as the Perfection Loop, Clinch, and Albright work well with this material. An option is to use a metal sleeve and crimp the loop. Attach a 40 lb. clip to attach the flies. Item# 3391