ANDE Fluorocarbon leader material is 100% fluorocarbon with all the properties that you expect: superb abrasion resistance, good knot strength, no water absorption, and a fast, consistent sink rate. With fluorocarbon's lower refractive index, it is invisible under water. Fluorocarbon comes in tests from 10 to 150 pound in clear and 20 to 60 pound in pink. It is available on 50-yard and 25-yard wrist skeins and one-pound spools.
Remember, it's ANDE quality at a very reasonable price.