Leech Mohair Black-Copper - Leech. The Black & Copper Mohair Leech has been tested widely across the planet and has proven itself capable to handle the most difficult of waters, these include the challenging fishing of New Zealand, and the United Kingdom. The Black and Copper Mohair Leech is tied to give a shaggier presentation which helps to give it a undulating motion which is where this fly draws it success from.