Seaguar In Shore Fluorocarbon Line 100 Yard Filler Spool (IS100) is made for inshore saltwater fishing, featuring the strength and abrasion resistance needed to fish around structure such as: rocks, docks, jettys, around heavy grass, and in reefs. This 100% fluorocabon line was made in Japan with cutting-edge innovation providing maximum impact and knot strength, and sinks faster than monofilament.