Gold Bead Head Copper John Fly Fishing Flies. 1 Dozen Flies Common fly in almost every river Sold in 1 dozens. Sizes are 14, 16 , 18. Also a combination of mixed sizes, 14, 16, and 18 (4qty of each size) High Quality Flies The Gold Bead Head Copper John is one of the most versatile and popular flies, among them the the fly that has become one of the most popular of modern patterns. Great to use as a dropper fly as well. Bead Head helps it make a quicker drop to the bottom. Available sizes are 14, 16, 18, and a mix of sizes 14-16-18.