Seaguar BASIX 100% Fluorocarbon is a mainline that delivers all the benefits of 100% fluorocarbon at a price everybody will love. BasiX is made from 100% custom Seaguar fluorocarbon resins so it's virtually invisible underwater and boasts the kind of knot strength and abrasion resistance you expect from Seaguar. This is a soft, supple, easy-casting line that comes off a reel smoothly for a fret-free fishing experience.