Thanks to elaborate workmanship and design, they are real gems and fully functional instruments, to give away or discover for yourself. They come from the Astromedia publishing house in Würzburg, and they do not need to shy away from the comparison with "professional" equipment at all - which is not necessarily to be expected from a kit of this kind. And they are - indeed - incomparably inexpensive: which gives the occupation with the matter an additional charm.