Micronymphs just as nymphs imitate aquatic insects drifting below surface. The main difference is that thay are significantly smaller in size. We often add to such micronimphs tungsten beads in order to get them slightly deeper in the water column. They are fantastic when fishing for wary fish and hih pressured fish such as greyling, trout and course fish species. Again, if you have any trouble with selecting the right fly, please contact us!