Glass Bead WD40 Black - The Glassbead WD40 Black is the new kid on the block but has quickly proved itself as a killer emerger. WD40's are available in a variety of colours the Black Glass Bead WD40 is a good general imitation of both Mayfly and Emerging Midge Nymph pattern. This emerger is best fished on a dead drift as a Pupa Midge at the end of your drift lift your rod to bring your Glass Bead Black WD-40 to the surface replicating the natural movement of the emerger. Try these out on you favourite tailwater or creek you won't believe the results.