The finely balanced hexagonal barrel and postable cap are made from solid brass and finished with a luxurious layer of platinum. Cross-hatched hexagons are carefully etched into the finish using diamond guillochage, an exacting technique commonly used in the manufacture of fine watches. They create an intriguing interplay of light and shadow that contrasts beautifully with the polished shine of the stainless steel nib, grip section, and flexible clip. - Caran d'Ache Ecridor Heritage Fountain Pen - MediumEcridor Avenue Fntn Pen, HERITAGE PLAT CTD MD -