Swiss Straw (Raffia), also known as Raffia, is a thin material that has the consistency of hay. It absorbs water to help reduce the buoyancy of the fly. It is primarily used for wing cases on nymphs, backs on scuds, sow bugs, carapaces on crayfish and shrimp patterns. It can be colored with permanent marker once on the fly to customize your pattern. 15 feet of material. USA.