The 9" x 12" postal approved self-sealing envelopes - clear (3 mil) are for mailings that stand out! Lightweight envelopes reduce mailing expenses and protect contents. Meet USPS mailing specifications, are automation compatible, and have peel-and-seal flap. Great for mailing out important documents such as annual reports, blue books, certificates, charters, company reports, concept statements, confidentiality agreements, consent forms, documents, dossiers, drafts, fact sheets, files, forms, leaflets, letters of agreement, lock ins, notices, petitions, planners, position papers, registrations, reports, schedules, rolling contracts, submissions, transcriptions, travelogues, typescripts, transliterations, green papers, ID's, cards, invitations, mailshots, bonds, diplomas, emails, letters, insurance papers, report cards, tickets, checks, and more. Quantity per carton is 500 envelopes.