RIO&';s 12ft Fluoroflex Permit Leaders are made of 100% fluorocarbon for maximum stealth and abrasion resistance when fishing clear flats for cruising or tailing permit. Fluorocarbon leaders also sink faster than their nylon equivalents, which is an advantage when targeting fish on deeper flats. With a long, medium-stiff butt section, this leader is tuned to deliver typical crab and shrimp patterns in the wind.