Scotch Foam Mounting Removable Squares, 1/2 x 1/2 Inch, 64 Squares, 4-PACK Mounting Squares can be used on wood, ceramic tile, gloss and semi gloss painted walls, glass and refridgerators Mounts posters and photos with easy removal and no damage to the wall 1/2 x 1/2 Inch squares Removable Package Include Bonus OfficeSupplyExpress Retractable Pen