A7 Envelopes - Astrobrights Celestial Blue - 5 1/4 x 7 1/4 (pack of 50) Size A7 (5 1/4 X 7 1/4) 50 Per Pack. Side Seams - - Open Side Square Flap - Regular Gummed FSC Certified - Manufactured Acid Free Recommended Applications - Greetings - Invitations - Announcements Holiday Cards - Photographs