Our revolutionary adhesive bonding system secures tightly to most surfaces including drywall, painted block, brick, glass, tile, paneling and most other wall surfaces. And as one of the "original" removable adhesives, it removes cleanly with no residue, oily spots, or marring of walls. . . ! These wall savers get an "A. " Teacher tested and preferred, this remarkable removable adhesive holds securely and removes cleanly up to 2 years. Removable Chart Mounting Tabs 1" x 1".