I've made stoneflies based on a number of formulas, but none look better or are more effective than those I make using this net foil for the backs of the bugs. In many cases, flies that look amazingly like the real bug don't work as well as flies that are flashier or more suggestive in terms of their movement in the water. Not so with net foil stoneflies. When the bugs are hatching, throw one of these and start counting the fish you've caught. Excellent product -- delivered as quickly as ever by Tactical Fly Fisher.