Nitinol (Nickel-Titanium) is incredibly kink resistant, the smaller diameters are perfect to build short "anti-jack tippets" when fishing with light tackle for Perch and Chub while the thicker stuff is there to target the big Mamas! You can either knot the material with a three turn clinch knot or use our preferred method and finish the traces with the Gurza "Brass Tube" crimps.