With most species taking far more of their natural food below the surface than on the top. Sinking lines get the fly down to these deeper feeding locations. Because feeding patterns, water depth and current vary, Cortland manufactures a wide range of sinking lines. Available in different densities (sink rates) to insure that there is a line right for any condition. 444 Sinking Lines come in varying shades of brown, with the lighter lines indicating aslower sink rate than the darker. Vendor: Cortland