When finicky fish turn their noses up at your dry fly, it's time to pull out the nymph rig, and Cortland Indicator material is perfect for such situations. Constructed from an opaque monofilament, and a special dye process to maintain color-fastness, Cortland Indicator Material stands out against any background, and remains visible in low-light conditions- making it perfect for European style nymphing, high-sticking, and even constructing coiled French style indicators. .33mm /.012". 20' length. Nylon monofilament. Made in USA.