Ultra-strong, 100% fluorocarbon with exceptionally high tensile strength, and exceptionally easy to tie knots in Made from 100% fluorocarbon High tensile strength Easy to tie Ideal for: Dry flies, soft hackles, nymphs We also offer Fluoroflex Strong in a "3-Pack", which includes three, 30-yard spools of tippet packaged in a reusable, clear plastic cup. The 3-Packs are available in both a 4X, 5X, 6X option, & a 3X, 4X, 5X option. Ultra-strong, 100% fluorocarbon with exceptionally high tensile strength, and exceptionally easy to tie knots in