Sufix Castable Invisiline 100-Percent Fluorocarbon casts like mono and is virtually invisible. It is resistant to ultra violet rays that can damage lines, it is incredibly strong, abrasion resistant and sensitve. There is a very low-stretch index for optimal hook setting power and sinks 4 times faster than traditional nylon lines for getting your presentation to the strike zone faster. Castable Invisiline has exceptional handling for both spinning and casting reels and the exclusive G2 precision Winding virtually eliminates line memory.