Our Tactical PT1 Strike Nymph works like a stimulator type of fly. Is tied with a thin mylar band that changes the colors from different angles. The Strike PT1 works when some classic and traditional flies don't work. Something is happening, when is is water and the fly passes the hunting zone of the fish, even if the fish don't eat in that moment will attach the fly. Probably is the curiosity, probably is the colors, but certain is that this fly works especially in fast and deep or colored rivers!