These Foam spools are great for setting up Dry Fly / Dropper Rigs before you leave for the water. I use them for making double nymph set-ups as well as dry fly droppers. Anything to save time while riverside. I also make a small slice in the edge of foam to make a great leader holder. These keep my leaders in order using the same plastic bag the original leader came in. Purchase price is for one foam spool.. (no flies included).