These really are pitch black. So that already makes them great. The ones you're looking at right now have ruled pages. You could keep lists of your black clothes in them. Or lists of the black clothes you hope to own in the future. Or a list of times you thought you wore too much black eye liner but then, in retrospect no — it was just enough.
You get a bundle of three memo books, and each book has 48 pages. They measure 3 and a half inches wide by 5 and a half inches high.