Seal it and send it. Flyers, newsletters, brochures and more stay securely fastened in the mail with these mailing seals with serrated edges. Affix the seals to the edge of the pages. Permanent adhesive keeps mailings from unfolding while in transit. Sealing is the smart way to ensure safe mailing. Legal Seals are ideal for certificates, awards, sealing envelopes and more. Customize by handwriting your message. Each sheet includes six seals.