Stimulator Brown. When juicy Stoneflies or desirable Salmon flies are on the surface then you won't go wrong if you have a Brown Stimulator on your tippet. This is a very industrious fly particularly in difficult fly fishing conditions. It also works wonderfully as a buoyant sight indicator where you can mix things up with your preferred nymph on a dropper. Double your chances of a take with the versatile and productive Brown Stimulator.