JAM Paper Navy Blue A2 Invitation Envelopes are made out of high quality, 28lb paper. Each one measures 4 3/8in x 5 3/4 inches, the perfect size for A2 invitations and greeting cards. This full carton contains a total of 1000 envelopes! Each one has a wide, rectangular straight flap with a reliable gum closure for keeping items securely enclosed as they travel through the mail! The dark, navy blue color of these envelopes makes them, great for multiple personal and professional mailing needs! Use these envelopes for invitations to weddings, conferences, and more! Use them to send response cards, Thank You Cards, or cards for the next holiday!