Generous bag of 2 to 3 inch fine pearl, iridescent or metallic fibers 2 to 4 inches log. A pinch can be pulled our and tied down in the middle and then folded back an lashed down. Good for accents on 2 to 4 inch wings.
It is just fine enough to get caught in the fine teeth on bass lips. After catching a bunch you can expect that the flash accent on your fly will will be reduced. When your fly is too torn up to continue, about all the fine flash will be gone.