Enjoy the efficiency and protection of these poly mailers for packaging all sorts of parcels to be mailed. These mailers are self-sealing with a peel-off paper backing that exposes the adhesive strip. They measure 12 inches long by 15 inches wide, accommodating items such as books, clothing, or toys that you want to send in the mail. The poly surface is ideal for attaching a self-adhesive address label. The surface can also be written on with a permanent marker.