A miniature component that is great for creating a rig that won't tangle. Can be used for nymphing, lake fly fishing, in short, where you use at least a minimally loaded fly. If you make the leader so that the main line is slightly stronger than the line that you tie the flies on, you will pluck at most one fly per hook.It is important to make a knot according to the instructions on the card or another knot that prevents the Roller from being threaded onto the knot Can be used on line with a diameter of 0.10 to 0.22 mm.