Pen

A writing instrument, in particular a fountain pen, having a writing tip and a writing part (13), which has, in particular, the writing tip and which can receive an elongated writing medium reservoir comprising a writing medium, in particular a writing cartridge comprising ink or ink-like writing medium, and having a removal aid (18) which is releasably connected to the writing part (13) for assisting the removal of a writing medium reservoir, which can be arranged or is arranged in the writing part (13), which removal aid having, in particular, a hollow-cylindrical receiving space for a preferably terminal connectable portion of the writing medium reservoir and one or more connecting parts (27) for releasably connecting the removal aid (18) to the connectable portion of the writing medium reservoir, wherein the or each connecting part (27) is configured such that, by the connecting part (27) bearing against the connectable portion of the writing medium reservoir, the removal aid (18) can be connected or is connected thereto by a releasable frictional connection, in particular by the deformation of a wall of the connectable portion of the writing medium reservoir by the connecting part (27), preferably by such a deformation which brings about an additional releasable positive connection between the removal aid (18) and the connectable portion.