Montblanc Bohème Rouge et Noir Mini Fountain Pen: At just 91.3 millimeters (3.6 inches) in length, Montblanc's Bohème Rouge et Noir Mini Fountain Pen lays claims to the title of the world's smallest fountain pen. The pen showcases intricate craftsmanship, featuring 74 parts made in Germany with stainless steel trims and engraved detailing that reflects Montblanc's signature design DNA.