The fly line is the most important part of successful fly casting. Even with an expensive fly rod, you cannot cast a fly if the fly line is not suitable for the fly. The easy-to-cast Eumer Iisi WF fly line is made for bottom casting and back casting on rivers and lakes. You can easily fish with both streamers and surface flies. The front end of the fly line has a line loop for attaching a cone jig. The length of the weighted front cone of the fly line is 8.5m and the total length with the running line is 25m. The fly line is one color, but you can make a mark between the front cone and the running line with a marker at the beginning of the casting exercises. When casting, only the weighted casting end is outside the rod tip. The running line is too light to cast. If you want to make longer casts than 8.5 meters, you should take extra line from the reel and lock it with your finger during the cast. At the end of the cast, the extra running line is released and the heavy casting head carries the running line with it. When choosing a suitable fly line for your fly, you should find out the weight class of your fly. If the weight class of the rod is #5, then choose a #5 class aYou can also choose a line one weight class higher, then it will be easier to cast even bigger flies and the casting exercises will be easier at the beginning.