The Pat's Stonefly Nymph is the KING of productivity in the stonefly nymph realm. It is as standard as Peanut Butter and Jelly sandwiches are to a 6 year old. Life without it.... well, lets just not go there. The Pat's Stone is available in a variety of sizes and colors to match any stonefly hatch and now availiable in a jig head format.