The Munro Killer is such an effective Salmon Fly pattern that it has derivatives tied on every format of Salmon Fly. A reliable Scottish fly for when the water conditions are really low. When nothing else is working and any fly is 'too big' these micro tubes may make the difference between success and failure. Fish with a light leader and use size 14 or 16 VMC treble hooks which will provide a very secure hook hold when a fish takes.