Cortland's Level Sinking Series is designed for shooting heads, trolling, and sink-tips. The Level Sinking Series allows anglers to cut to a desired length for heads and tips or use as is for trolling. Ideal for stripping the PVC jacket and creating a loop for quick and easy tip, head, and leader changes. The Level Sinking Series is rated in Grains Per Foot (GPF) and Inches Per Second (IPS).