Sufix Advance Fluorocarbon is high-performance fluorocarbon designed for use as either mainline or leader. Employs Sufix’s proprietary “Gel Phase Technology” to create a fishing line that exhibits the best handling, sensitivity, performance, and clarity. Virtually invisible underwater, making it a great choice for finicky fish. Higher density index allows it to sink faster and get your presentation to strike zone more quickly. Available in pound tests ranging from 4 to 30 pound.