You only need them Ed for a few nymph patterns. I used to use them for wings on "Catskill" dry flies, but long ago switched to Compara-duns and parachutes. You need coastal deer hair, calf tail, hackle and dubbing. Word of advice.....you don't save money tying flies if that is your reason. But it's fun and instead of going on the stream with 2 dozen flies in your vest, you go on the stream with 500 or more......to match one bug........hahahaha