Double bead weighted Twenty Incher nymph fishing flies are one of the hottest fly patterns on the river Double bead fly fishing nymph flies for getting deep in the water column quickly Excellent trout, bass or steelhead fly fishing flies. Pack of 12 - 20 Incher Fly Fishing Nymph Flies - Hook Size 12 Essential on freestone rivers where stonefly nymphs are an important trout food.