Roboworm Sculpin Lure, Natural Shad, 4-Inch With the FX Special Effects colors, Roboworm has taken natural, fish catching colors and patterns to the next level. You get the rich, clear, distinct layers of colors Robo is famous for and a new process that creates dots, dashes, and stripes along the inside of the lure body. These striations are not only very natural and life-like but since they are inside the bait, you get a unique 3D effect that attracts fish and gives even wary bass confidence to eat.