Construction
Such nibs are usually of 14K gold alloy. Alloys with a higher proportion of gold—most commonly 18K—are too soft to flex properly; rather than flexing they are liable to bend and then stay in their new position. Vintage steel nibs can have flex, the best known example being the Esterbrook 9128 nib. However steel flex nibs on fountain pens are rare: flex nibs required a considerable investment of skill to make, and the steel nibs of the time had poor resistance to corrosion from the often acidic inks of the time.
Read more about this topic: Flex Nibs
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