The finely balanced hexagonal barrel and postable cap are made from solid brass and finished with a layer of platinum. The delicate mesh pattern is carefully etched into the platinum finish using diamond guillochage, an exacting technique used in the manufacture of fine watches. It creates intriguing visual depth and a gratifying texture that contrasts beautifully with the smooth, polished finish of the stainless steel nib, grip section, and flexible clip. - Caran d'Ache Milanese Mesh Fountain Pen - Fine.