Conklin Duragraph Ice Blue Fountain Pen The Duragraph Fountain pen brings a fresh, modern style to this timeless oversize flat-top design. Crafted from quality hand made resins, the Duragraph fountain pen is substantial in size, yet not so large to be unwieldy in the hand. All Conklin fountain pens are equipped with JoWo nibs in 6 sizes, Extra Fine, Fine, Medium, Broad, 1.1stub and Omniflex. Filling with standard international cartridges and Schmidt K-6 Converter.