3M Scotch Permanent Foam Mounting Squares is a carded pack of 16 1-inch x 1-inch heavy-duty double-sided foam mounting squares. Used to wall-mount pictures and decorations. They adhere and conform to a variety of surfaces such as walls and ceramic tile (please note that this is a permanent tape and may cause damage if removed). Can hold up to 1 pound of weight (use 2 squares for each half-pound of weight to be held). The foam is approximately 1/16 inch thick.