Book darts can be used as bookmarks for books, notebooks, etc. It is very thin so it wont get in the way even if you put multiple pieces in a book. It is very useful for studying and working. Convenient book darts that can be used repeatedly. 5 each of 3 color book darts in brass, bronze and stainless steel, total of 15 pieces. Bronze (copper) type may be partially dullness due to its surface treatment. The bronze will also change to a tasteful color with use.