The something slightly twisted outer mold moves toward an equally twisted, different colored grip and opens centrally on the spring again deposed by the handle-light blue and has a slip-stop.
It is very nice that the filler suitable for both left- and right-handed, and thus is virtually neutral stance, even for narrower or wider finger.
A notable example is the real, dark blue grip by appealing material. This is neither too hard nor too soft, but comfortable to the touch, especially since it's not rubberized, which feel the hands of children in the long run as rather unpleasant.
The ink flow is as great as the weight of the filler and the easy handling when replacing the ink cartridges. Even a Kolbenkonvertert can use to ...
A fully convincing, surprisingly appealing innovation for a cheap filler - from the outset highly recommended!