The Gummi Flash Baitfish is a realistic looking fly that is easy to tie and very effective on bass, trout, and many saltwater species. It is a good fly to learn the basics of working with Gummi Body and Gummy Flash materials. If you use hook sizes 2/0-1 use the .040 Gummi Body, if you use hook sizes 2-4 use the .020 Gummi Body.