The Plan D Pack Articulated Fly Box is a patent-pending design that keeps articulated flies organized and ready to use. Hook blocks on either end. Room for 20 full-sized articulated flies. 2 rows of marine grade stainless hooks, 10 per row. ¼" closed cell EVA foam with micro slits for seating flies. Simply hook the eye of the fly on the stainless hook and seat the fly hook in the foam. The big brother to the Plan D Pocket Articulated Fly Box.Clear plastic. 9½"L x 5½"W x 1½"D. Imported.