When using our Mounting Squares, you will enjoy a no-mess, touch free application that wont leave any residue or staining behind like other rubber based glue products can! They are perfect for mounting pictures and for a variety of other scrapbooking materials. .500 mounting squares .? x 1/2 / 6 x 13mm .Clear, permanent, double-sided adhesiive .Perfect for mounting small or narrow items .Acid free and archival safe