Spiderwire® Ultracast™ 100% Fluorocarbon is the Thinnest, Strongest, Most Sensitive Fluorocarbon ever made. Besides being ultra-clear and invisible, it has exceptionally high strength per diameter compared to all other fluorocarbons. Its thin diameter actually helps baits perfom much better, yet its ultimate sensitivity transmits strikes and structure better than any other fluorocarbon on the market today. With Spiderwire®, Nothing Get's Away!