Blades designed for attaching to soft baits! Adding a blade increases the visual attraction of any soft bait plus adds to the noise/vibration attraction. Placed above your lure a Fix'Flash blade will also help your bait to glide through the water, particularly effective when you are after pike.
Different colours let you play with a showy flash or a more discrete colour contrast. These blades are great when the fishing is harder and have been used for years by top perch and pike anglers!