I've been teaching for 13 years, and it is so hard to keep stuff on the walls. Masking tape eventually falls off. Hot Glue is against the rules. Sticky tack doesn't always hold and its messy. I used 3M Command hooks for the first time this past year and I loved them. Originally I went looking for something strong enough to hold my Monthly Quilts that were a classroom gift. It worked so well, I will only use these products from now on... from the hooks to just the foamy pieces on posters. You've hooked me!