Hedron Microlon is a ultra-light, ultra-strong 70 denier flat nylon synthetic material that can be used for as a wet fly hackle on large and small patterns. Great for legs and abdomens on nymph patterns. Using a dubbing loop, you can create some awesome mottled color variations with Microlon. Great for flies, jigs, spinner baits and dressing treble hooks. It flows in the water naturally and is easy to tie with. Hedron has been manufacturing quality fly tying products since 1982.