Fluorocarbon is nearly invisible under water, sinks much faster than regular nylon, and is super abrasion resistant. These characteristics make it ideal for nymph and chironomid fishing and any time you are using sinking lines. Umpqua's SuperFluoro is the latest generation of 100% fluorocarbon tippet material. It has very high breaking strength for the diameter and has better knot strength. It is also softer than some fluorocarbon materials for more natural presentations. Recommended for Umpqua's SuperFluoro, Trout and Power Taper leaders. 30 yards per spool.