THICK and DURABLE ENVELOPES - made from the most popular business letterhead or stationery weight of 24lb bond / 60lb text paper that greatly holds mailing documents; Gummed Booklet Style Square Flap that provides extra security for document's safe-keeping STANDARD A7 SIZED ENVELOPES - 7 1/4” x 5 1/4” inches that fit any 5 x 7 letters, postcards, greeting cards, photos, announcements, social and invitation purposes and more; ideal large reply envelope size that fits inside A8, A9 and A10 sizes envelopes PERFECT FOR BUSINESS OR PERSONAL USE - great for enclosing your Save the Dates, DIY Invitations, Thank you cards, Graduation announcements, Do-It-Your-self Greeting Cards, and business correspondence; it can be hand addressed or professionally printed