Surflon Micro Ultra 1x19 filaments is more flexible than Surflon 1x7. The Surflon Micro Ultra has a smooth nylon coating that adds knot strength, provides greater durability, and makes the thread easy to knot. You can connect the guide wire with common monofilament knots such as the Albright Knot, Clinch Knot, Nail Knot, Perfection Loop, Uni-Knot, etc.. Low stretch and high sensitivity enable remarkable performance. Its naturalness and softness make it particularly suitable for fly fishing, creating a leader where the presentation of the most natural bait possible is required, strong protection from the bite of the predator. Surflon Micro Ultra is an economical alternative to Surflon Micro Supreme. It is an excellent quality line for Barracuda and predatory fish in general, Bluefish, Mackerel, Shark, Wahoo, and other big game fish. Made in the USA by AFW.