These are double sided vertical book tabs. They are brightly-colored, multicolored tabs. Easy to apply with the Tab Placement Guide. I would caution you to take your time when applying because if you place the tab crooked, it will stay crooked. The adhesive is excellent and that is a good thing, but you can't pull the tab off and realign it. This will more than likely tear the fragile page. The manufacturer does include two 'practice' tabs so you can learn how to properly apply them (on another piece of paper) before you put them on your beautiful bible pages. Also, bible pages are thin, so be careful that you don't have TWO pages when you put them on.