The Copper John is a popular and effective pattern that has taken a stronghold in the fly fishing world. This fly sinks quickly and can be used as a deep nymph or a dropper. Fish seem unable to resist the combination of color, flash, and realistic shape. It works best where you will find mayflies or stoneflies and will even work in most stillwater sutiations. Just about all guides and serious anglers never enter the river without several sizes, colors, and variations of the Copper John in their fly box.