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UHU Tac Adhesive Putty$2.79
Adheres to most clean, dry surfaces without tacks, tape or glue—won't stain or dry out. It's the no-mess way to easily hold paper items in place. Best of all, it's removable and reusable.
It's also perfect for anchoring collectables on shelves, computer keyboards on your desktop, or anything you want to stay in place.