Here we have a Pilot writing pen, although in my opinion I like them for a multitude of other uses to which they are very suited, more of which later.
What to say about this? Well, its very much what you see is what you get, there is no fancy over designed additions or build in the pen itself externally, barrel, cap and pocket clip are all there are, it does not come apart and is not refillable, but what it does do is endure, and write very well from start of ink flow to finish, a solid black line with no skipping or missed curves. As you can expect from the 0.5 on the barrel, the nib and the written line is very fine, but still strong and very legible, if you do not have terrible handwriting like I do.The ink itself lays down very well and drys quickly, no discernible smudging or wetness is left on the page when writing. This is in contradiction, for me anyway, to the pure liquid ink advertised on the barrel, I would have expected a very wet line to be laid down with care haign to be taken to avoid smudging, but happily I was very wrong in my initial expectations.
And here is the nib itself, as you can see it is fine, a needle point in my opinion, but surprisingly robust and stands up to a lot of abuse, I'm a bit heavy handed when writing and I have not had any issues with the nib or the writing performance.
What, precisely, the pure liquid ink is supposed to benefit or deliver I'm not too sure, but I suppose liquid ink flows smoother and more consistently than other inks, on reflection the ink flow is rather like fountain pen ink and the line when writing does have that feel to it, so I guess the intention is give the best of both worlds in a fine nibbed rollerball.The pocket clip is very springy and firm when slipped over over pockets, especially thicker material ones, the clip itself is very robust and stands up to a lot of abuse, so much so that if the spring on the clip is not enough it can be gently bent to provide a stronger grip.
Further to the comment in the opening paragraph, I really like drawing with these pens, a great use for them I think, the pen and the nib suits my style and drawing technique, if they came with artist grade ink, permanent, lightfast etc I think they would be come my default and go to pen for drawing, especially with a range of nib sizes offered. And yes, that is my representation of Leon played by Jean Reno in the film of the same name, the remake anyway, one of the very few examples where the remake is as good as the original, possibly.