PLEASE NOTE: 3X, 4X and 5X indicate the line diameter and type and NOT quantity.  One 25m spool is supplied per purchase. Tapered Leader - Fluorocarbon w/Perfection Loop - Frog Hair FC High Performance Fluorocarbon tapered leaders have a stiffer butt section to optimize the energy transfer from the fly line and a supple tippet that offers superior knot strength. incredible toughness. and built-in shock resistance to deliver a more stealthy. drag-free presentation compared to other fluorocarbon tapered leaders.