We change locks on our lockers each semester. We wrote out the combo, attached it to the back of all of the locks. Now each semester the students give us the sticker we place it in the book and have an accurate reading of the combo, when they forget it. Then at the end of the semester they puy the labels back on and we reuse them, randomly. This product is the only way to put them on paper and back to the lock - saving us from rewriting them constantly.