Best-In-Class Strength And Suppleness, Premium, 100% Fluorocarbon Performance Fishing Line, Virtually Invisible. R18 is Seaguar Japan's premier fluorocarbon mainline with top-of-the-line overall performance. It delivers excellent performance in three key areas: strength, suppleness, and castability. This line was created with Seaguar's exclusive double-structure process with two custom Seaguar 100% fluorocarbon resins to create a line with exceptional knot and tensile strength. It's soft, supple and very manageable - easy casting and very smooth coming off your reel. They are offered on 100-meter spools which is 109 yards. Available in 4 through 20 lb. test including some unique, nontraditional sizes: 5, 7, and 14 lb. test. R18 is part of the Seaguar JDM Collection - imported from Japan for tackle junkies, avid anglers and professional fishermen.