The Silver Copper John a popular and effective attrractor nymph pattern has taken the fly fishing world by storm. 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 is best fished where stoneflies and mayflies are found but will work in nearly any situation including Steelhead nymphing and even on lakes. Most guides and serious anglers never enter the river without several sizes, colors, and variations of the Copper John in their fly box..