This smooth saltwater fly line was specifically designed for challenging bonefish, permit, and tarpon in the most demanding tropical climates. Scientific Anglers Mastery Grand Slam is an over-weighted floating line with a short, powerful headthe perfect combination for sight fishing. Because it loads the rod quickly, cuts through the wind, and turns over tarpon-sized flies with ease, this Scientific Anglers is well-adapted for machine-gun casting to fish on the move. Tropi-Core technology for hot weather. Designed for permit, tarpon, and bones Casts big, bulky flies with ease Over-weighted by nearly a full line weight Short, powerful head Quick rod loading Carves through the wind Tropi-Core technology