Wapsi Thin Skin is .004″ thick and can be used on flies past size 18. It is stretchable and transluscent with a matte finish on one side and a shiny finish on the other. The backing makes it easy to cut to width. Wapsi Thin Skin Mottled Bustard is the sweet spot of a bustard feather printed on thin skin. It is a fine looking pattern great on stoneflies and nymphs.