The Optima Flex has the new Flex Nib introduced by Aurora. It is the result of a passionate research to enhance the pleasure of leaving a mark. Infact the Aurora Flex Nib, while not a calligraphy nib, allows everyone to vary the stroke size with extraordinary simplicity by applying a different pressure when writing. The 14k nib with ebonite feed is a “must have” for any calligraphy lover and collector. Limited to just 330 of each color.