I used these to mark a quilt project that I was tacking here and there. They came in really handy. The stickers showed me where I had not tacked yet. They had enough sticky left to reuse. But I found it was just easier to pitch the used sticker than to try and save it someplace safe for the next time. If I was using a lot of stickers and moving around the project. I would have used over and over until the sticky was gone off the back. I recommend this product when you need something simple to mark that can be removed quickly. I actually used my on the fabric this time around and not on a ruler.