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Flex nibs
''Flex'' or ''flexible nibs'' are fountain pen nibs that produce a line proportional in width to the pressure used. A very flexible nib can produce a width variation of about six times. Extremely flexible nibs are sometimes known among collectors as "wet noodles".
Flex nibs should not be confused with nibs that merely offer a cushioned feel in writing, or even those that vary line wetness and colour saturation with pressure. Such nibs are known merely as 'soft'.
== 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 (often acidic) contemporaneous inks.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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