More importantly to me the following: Unfortunately, the envisaged main advantage of this pin - small, easy to carry - my opinion inconsistently implemented.
While the pin is not long, but - based on the length - very, very thick (does not fit into pen loops for very small calendar / notebooks) and too heavy (if one on a small calendar, a small, lightweight (Hand -) bag etc. arrives).
Too Bad. I have therefore the pico but returned.
For someone who, although a small pen would, however, which should be very stable and quite heavy in the hand, quickly perceive by the weight in a shirt or trouser pocket and find the Pico but can be quite perfect.
I have for me but fortunately found something else: the pen-Petit B (of X47). The is even shorter, but mostly much narrower and can also be extended by reaction / fitting the cap for writing. For my purposes (see above) matches the better.
Whom therefore the thickness and heaviness of pico do not disturb (and who understands about as a sign of quality): Clear recommendation!
Anyone - like me - a little small (er) s, but rather Filigranes and easy searches: Clear recommendation for the Petit-B!