I bought these darts because they looked thin and would not add bulk to my notebooks. I still can’t decide which colour I like most; probably the rose gold. Two things to note: they are fingerprint magnets, and there’s a lip on the underside of the dart that marks the next page when you close the notebook; they don’t make huge dents, but the dent is there just the same. They work well on thin paper, but once you put them on thicker paper, there is no going back; they don’t snap back to their original shape and become too loose to use on thinner paper again. However, I was able to cut the lip, take a hammer to the dart and restore it to a somewhat flat state so that I could use it on TR paper again. Once I was able to that, I used the darts to create different sections in my notebook to easily access them. I have them so I’ll use them, but won’t be buying them again. Instead, I will use different washi tapes to separate my notebook into sections, maybe 2-inch-long pieces that I will use as index tabs wrapped around the edge of the page so that they are flush to it.

Fun! Super thin, and it does exactly as advertised. I use this in books for reading and school textbooks. Great if you are sick and tired of folding corners and sticky notes.

I like being able to permanently mark certain pages for frequent reference.

These have a bit of heft, so they're strong enough to last a while, but they're not too bulky.
Glad I got a little pack of them. I'm not sure I'd need a larger amount, but this is perfect.

Nope....for the most part, they really don't stay in place. They are super thin and on the flimsy side. Either they are too tight to actually slide onto thicker pages, or they are too loose for the thin pages. I was hoping to use these as page markers for various notebooks and for adult coloring books with works-in-progress. I've tried them in regular books--a couple of paperbacks, and my Bible and prayer book---nope. Still not very good. Maybe one or two of the darts actually slid on the way they were supposed to, but like I said earlier--for the most part, they don't really work. Won't be buying these again, and I can't really recommend them either.

Pro- they are indeed slim and sleek; Con- they are super thin and almost flimsy. Basically the properties that enable them to barely take up space in a book are the properties that make me concerned for their durability over time. I'd have to keep these in the pages of a book or else they'd get easily bent out of shape. They're okay, not what I was expecting but get the job done.