Ultra strong, supple, 100% fluorocarbon with the highest knot and tensile strength of any fluorocarbon on the market. The thin diameter and supple nature of this material make this a fantastic fluoro for the trout fly fisher. Fluoroflex Plus 3-Pack includes three, 30-yard spools of tippet packaged in a reusable, clear plastic cup. The 3-Packs are available in 3X-5X & 4X-6X.