The Barr Emerger,Glass Bead Head, Blue Wing Olive Fly matches the early stages of a hatching mayfly. Created by John Barr, it can be fished deep as a nymph, through the middle of the water column, or just under the surface. This emerger closely resembles a baetis or blue winged olive mayfly but it will work on many waters all year long. The weight of the bead makes this a great pattern to drop off of a dry fly. The flash from the bead matches natural gas bubbles emerging mayflies have and will help the fish single out your fly among the naturals.