Diplomat Aero Funky - Fountain PenA Captivating Finish for a Limited Production Unlike other models in the AERO range, the AERO FUNKY features a smooth surface, offering an exceptional grip and fluidity. But its true distinction lies in its double surface treatment: PVD + Niobium. Niobium is a rare metal often used in jewelry and the aerospace industry for its ability to create unique color effects. Combined with PVD treatment, it gives the AERO FUNKY a stunning finish with ever