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A third possible classification, even less uniform in terms of terminology used, and which often has no official reference in the production of the various companies is that one relating to the greater or lesser flexibility of the nib, a classification that also tends to get lost in modern production, dominated by rigid nibs. One of the problems of fountain pens (considered a disadvantage against the ballpoint, and when solved used by manufacturer as a promotion factor for their pens) is that excessive pressure on the nib can harm the same, which makes it quite difficult to  trace.<ref> Today the problem hardly exists with the spread of digital, but it was not trivial when copies had to be made by tracing with carbon paper.</ref> For this reason one of the few coherent terminologies is that of the so-called accounting nibs (''[[accountant nib]]''), often also called ''[[Manifold]]'', very rigid and hard, usable for this reason also for accounting jobs where carbon paper copies were the norm.

A third possible classification, even less uniform in terms of terminology used, and which often has no official reference in the production of the various companies is that one relating to the greater or lesser flexibility of the nib, a classification that also tends to get lost in modern production, dominated by rigid nibs. One of the problems of fountain pens (considered a disadvantage against the ballpoint, and when solved used by manufacturer as a promotion factor for their pens) is that excessive pressure on the nib can harm the same, which makes it quite difficult to  trace.<ref> Today the problem hardly exists with the spread of digital, but it was not trivial when copies had to be made by tracing with carbon paper.</ref> For this reason one of the few coherent terminologies is that of the so-called accounting nibs (''[[accountant nib]]''), often also called ''[[Manifold]]'', very rigid and hard, usable for this reason also for accounting jobs where carbon paper copies were the norm.

Non esistendo riguardo la flessibilità una terminologia ufficiale, (anche se alcune marche, come la [[Eversharp]] marcavano esplicitamente alcuni fra i propri pennini flessibili con la scritta ''Flexible'') quella adottata nasce dalle convenzioni stabilite dai collezionisti, ed ha quindi anche un ampio margine di aleatorietà. Si è pertanto deciso, in maniera del tutto arbitraria, di fare riferimento alle seguenti definizioni:<ref>si è fatto riferimento alle definizioni di Davis Nishimura, come riportate in [http://www.paperpenalia.com/flex1.html questo articolo] pur non seguendole completamente.</ref>

Since there is no official terminology about flexibility, (even if some brands, such as [[Eversharp]] explicitly marked some of their flexible nibs with the words ''Flexible'') the adopted one comes from the conventions established by collectors, and therefore also has a wide margin of randomness. We therefore decided, in a completely arbitrary way, to refer to the following definitions:<ref>we started from the definitions of Davis Nishimura, as reported in [http://www.paperpenalia.com/flex1.html this article] even though they are not completely followed.</ref>

* '''molleggiato''' pennino che risponde alla pressione, ma senza creare una significativa variazione del tratto, molti pennini moderni dichiarati ''flessibili'' rientrano in questa categoria.

* '''molleggiato''' pennino che risponde alla pressione, ma senza creare una significativa variazione del tratto, molti pennini moderni dichiarati ''flessibili'' rientrano in questa categoria.