With the copper wire and the tinsel you can create a scratch on the body of the artificial fly that simulates the segments of the abdomen of the insect you want to imitate. When making your dressing remember that copper weighs more than tinsel, it is therefore not recommended to use a copper wire too large to make dry flies because it would affect the floatability. With lead wire you can tie subbodies to weigh down your artificial flies without having to oversize the tungsten beads. All these materials are wound on bobbins that greatly simplify their use.