Seal it, send it and smile. Flyers, newsletters, brochures and more stay securely fastened in the mail with these Print or Write Mailing Seals. Affix the seals to the edge of the pages, and the permanent adhesive keeps mailings from unfolding while in transit. Customize with free templates available on the Avery site. Sealing is the smart way to ensure safe mailing, so you can smile without worry.