Wychwood Lure Mode Flourocarbon Tippet 50m - 0.25mm 10lb

This material is robust, just what you need when you're pulling large flies, trying to provoke an aggressive take, and has terrific linear and knot strength. Fluorocarbon has very little in the way of a refractive index and as such it is very difficult to see when submerged, so is the ideal choice for most.