I use this great little Nymph in conjunction with a large Cicada pattern. I tie this on the back of the Dry Fly with about 3/4 of a meter of 6 pound Fluorocarbon. I use this when the trout are not quite taking off the surface, more feeding mid water. Blue is by far my favorite colour for the day, or light conditions. I have not come across a trout that has refused this excellent dropper. It has a 2.7 ml Tungsten bead for weight and so will get down in most water conditions. If you don’t have this in your fly box you are limiting your chances of catching fussy trout.