Now on Firhole Sticks brand barbless competition hooks. Stupid sharp, super strong.
The iridescent bead in the thorax adds a distinctive strike trigger for fish. Fish probably think it is a gas bubble of an emerging mayfly. As if fish can "think" with logic & reason. never the less, I have had success with this pattern way back to the late 90's while fishing the Deschutes river and now while other fishing western tailwaters and spring creeks.