BIG FISH REQUIRE HEAVY DUTY (HD) DECEPTION - Big, wary fish require a special type of line and Umpquas Deceiver HD is it! Deceiver HD provides the best abrasion resistance & knot strength any fluorocarbon has to offer and yet remains nearly invisible to fish. Stiffer than Deceiver X, Deceiver HD provides greater mass for turning over larger flies and is your best choice when big fish, big flies, coral heads or boulder-strewn torrents are the challenges of the day.