This is one of the famous "rubber flies" from Iceland. This one is created by the fly tying guru Gylfi Kristjànsson. It has proven irresistable to most species. Especially for trout and char, but also for the salmon.
Hook : Ahrex FW540 Curved Nymph #12
Tying Thread : Semperfli Nanosilk 18/0, Black
Head : Brassbead, Gold
Weight : Lead
Tail : Pheasant Tail, Yellow/Olive
Tag : Seal Fùr, Fluoro Orange or Fluoro Red
Body : Hends Body Glass, Black
This fly need to be heavy. If you only have brass-beads in stock use a lot of lead in the thorax area. If you have tungsten beads, you can add a little less. Use superglue to keep the body glass there it should be, on the fly.
See the SBS pictures of the fly her: SBS Krokùrinn