Brass coneheads are mainly used to make the streamer heads. Their shape makes your artificial flies very hydrodynamic, minimizing friction with water during fishing.
Brass weighs less than half the weight of tungsten, so your dressing will have a much more natural and fluid movement in calm waters or light currents. But don't be fooled by the different specific gravity of the two materials, in fact our XL coneheads weigh just under 3 grams, and they will be able to sink your streamers very quickly.
Some of the models here have a groove in which you can apply adhesive eyes to make your imitation even more realistic and attractive.