Are you worried about the weak seal of the catalog mailing envelopes? It takes a lot of time and energy to apply another layer of glue each time to prevent the envelopes from peeling off during the mailing process. Our self seal catalog envelopes can completely avoid this problem! Designed with strong adhesive tape on flap providing customers complete security in bulk mailing and everyday business correspondence! Perfect size for mailing catalogs, A4 size documents, letters, annual reports, brochures, magazines, invitations.