Package contains: 100 pack Self Seal Photo Document Mailers with "DO NOT BEND" labels. Material?paperboard Size: 9X12 inch The adhesive on cardboard Photo Document Mailers creates a strong lasting seal and prevents your contents from falling out during transit and protect them well. These Photo Document Envelopes are perfect for mailing soft goods, photographs, documents and printouts. Ideal choice post offices, packaging wholesalers, mail order companies, office stationery suppliers, online stores, home or personal use.