This is one of those "must have" tools. Not only is it invaluable for finding the center of an item, but it's incredibly handy for placing individual letter stickers...just line them up on the edge of the ruler and your word is perfectly spaced, perfectly even, and perfectly centered. It's flexibility allows you to use it on a round item (try that with a standard wooden ruler!), and it's transparent enough so that there's no guessing, no matter what color paper you're using. I don't scrap without it!