The Umpqua San Juan Worm is one of the most productive fly patterns ever created. They are a must-have pattern for any tailwater. Excellent lead fly in two-fly nymph rigs, when picky trout need some extra enticing. Sizes: #8, #10, #12, #16. Colors: Fire Orange, Red, Shell Pink, Hot Pink. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Flies.