3M Scotch Heavy Duty 1-Inch Mounting Squares – Link
Amazon has this marked down to $2.97.
Note that this is an Add-on Item which ships with a $25 Amazon order.
- Made in USA
- Double-coated 1-inch foam squares
- Adhere and conform to a variety of surfaces
- Ideal for mounting pictures and decorations on most types of walls
- Permanently bonds to most surfaces
- Squares hold up to 2 pounds