Our window clings are printed on non-adhesive, no residue film that allows the clings to be easily adhered to any glass surface statically and then removed and used again at a later date because the films do not use any kind of chemical adhesives for their sticky properties. Our standard printing method is to reverse print the graphic message so that the cling can be installed from the interior side of a window to ensure the print can be properly viewed through the glass from the outside looking in. Clings are printed on clear or white film with a glossy finish.