I remember how much trouble I used to have with the original pen loop that the wallet came with back in the day. Having one that you can stick wherever you like is a huge improvement. The design of the 3M sticky part of the loop is oval-shaped now and it sticks just as good as ever. I've never had one fall off from use, though I suggest you play around with where you might want to place it before you remove the backing and slap it on. A lot will depend on the type of pen you use, its length and thickness, so put your chosen pen through the loop and play with the positioning before you adhere it to the wallet.