A popular fly for imitating the Cahill Duns found across the country. The Light Cahill is also a great fly for matching the PMD (Pale Morning Dun) hatch or the often overlooked Red Quill (Blue Winged Red Quill) hatch. It is tied to float high and ride the water like a natural. Per 3. Sizes: 12, 14, 16, 18.