Fishing line can vary a lot and it is a good idea to make sure that you get the right one for the job. It is good seeing what is available to consider what will be the best. This line is made by SeaKinght and it is 100m of line which is strong and durable. It has great tensile and knot strength. It will work perfectly well after a significant amount of time underwater. It has low visibility underwater so fish are less likely to spot it due to being made from fluorocarbon. It has low stretch and high density and sinks fast for lower water resistance. This means the fly will quickly get to the bottom with less need for weights.