Cyclops Bead Eyes are plated brass beads designed to weight your nymphs and get them down where the fish are. They’re countersunk to allow the tyer to slide them on easy (small hole slides on first). Cyclops Eyes are polished so they reflect light and attract fish. We like to use double and sometimes triple beads on bigger nymphs like Stoneflies to really drop them deep fast, especially in rough water. They have their place in saltwater flies too. We use these on keel style flies like the Avalon Fly to add extra weight and noise of the beads rattling against each other.