The Predator 3D sinking lines will help you get the big flies out there and then down to them in whatever sink rate you need. Whether fishing for trout, bass, pike, or musky there are times when a large fly is the best option, and the Predator is designed to cast them. The F/I/S3 incorporates a floating running line (F), an intermediate sink-rate (I) mid-section and a 3 inch per second sink-rate (S3) head. Whether floating or sink tip, each line is built on RIO’s low stretch ConnectCore Plus for maximum performance, and features SlickCast—the slickest, most durable coating on the market.