In moving water, getting flies below the surface while maintaining control can present a challenge. That's why sink-tip lines were introduced. The Frequency Sink Tip Fly Line features a Type III 10 inch sinking tip, great for streamer fishing from a boat, while wading, or just about anywhere. Ideal for streamers and wet flies for trout, steelhead and salmon Fast-sinking 10 inch tip sinks flies through the water column Mid-length head enhances control Best used in moving water.