Scientific Anglers Frequency Full Sink - Dark Gray - Sink 6Scientific Anglers Frequency Full Sink Dark Gray is a versatile sinking fly line designed for stillwater anglers who want better depth control when fishing lakes and ponds. Its thin diameter helps it cut through wind, while the mid length head supports accurate casting and solid line management on streamer and wet fly presentations. Key Features Stillwater Performance: Built for lakes and ponds where a full sinking line helps keep flies in the strike