I bought these page markers for my Hobonichi planner so that I can mark the current date, the new month page, and clip some spare grid paper to the journal because I find that it just doesn't have enough spare grid paper for me to write things that aren't well suited to the day planner pages.
The Hobonichi planner pages are extremely thing but the brass page markers do not cause the marked pages (including the ones used to clip extra grid paper) to flare out or cause the binding to noticeably bend/curve. The brass page markers are very thin and well suited to my use case for this reason. They are also very light, which I prefer (in case anyone wants it to serve as a paperweight, I do not think it would serve this purpose).
The brass colour is simple yet elegant. The design is minimalist (which I like a lot), so I don't doubt that they will be a timeless possession.
I would definitely recommend this product if you are looking for a page marker.