Halo Emerger Hook: TMC 2457 Size: 16 ~ 18 Thread: 6/0 Olive (Flat Thread e.g. UTC 70 or Gudebrod) Tail: 3 Natural Turkey Flat Barbules Abdomen: Silver Holographic Tinsel, Small Thorax: 3 Peacock Herl Legs: Mini Olive/White Tarantu-Legs Head: Bead, Gold/Copper (#14 =3/32", #16 ~ 18 = 5/64") NOTE: Use this fly as the trailing fly in a 2 fly rig. I like to fish it down and across, wet fly style, in 1 to 3 feet of swiftly moving water. Most takes will be in the middle or at the end of the swing.