Semperfli Perdigon Body material has been specially designed for creation of perfect small perdigon flies It is soft yet strong enough to use on a tying bobbin for easy build up of body. The materials are designed to have different effects either iridescent, fluorescent or transluscent to give stunning effects on perdigon fly bodies so it's color appears to change when viewed in different light and at different angles. Features Include:Spooled Perdigon body30 meters per spoolSoft, strong material0.4mm widthIridescent, fluorescent and transluscent colors