Troutline Coloured 1.5mm Brass Beads are made of high quality brass and are dedicated for tying nymphs and streamers. Brass is almost 2 time lighter than lead and that means more movement for fly without loosing sparkle.
Brass is indicated in rivers with high fishing pressure where trout and grayling are very careful in picking flies which behave like a rock ( super heavy tungsten beads used ). If you fish in rivers with slow running waters without deep pools or strong currents, then brass is the choice.