Mayfly Flies- BWO Dry Fly 12 Piece Fly Assortment Kit Mayfly - BWO - Blue Wing Olive - Dry flies from Montana Fly Company 12 flies = 2x Purple Haze Chute #18(dry flies), 2x Traditional BWO #18, 2x High Vis Parachute #18, 2X Trina's X-body Parachute #18, 2X Adams #18, 2x Etha wing - Dun #18 The flies are stored in a 6 compartment plastic fly box If you would like to substitute size 16 for any of the flies just email us after you purchased the kit.