MFC Downey's Master Baetis Nymph- This pattern is a great all around BWO/Baetis nymph. Brad Downey ties some of the coolest mayfly patterns which represent the full life cycle of different mayflies, from nymphs to spinners. Run it on a multiple nymph rig or as the end fly on a dry/dropper rig. You wont be disappointed. Size 20.