A7 Envelopes (5 1/4 x 7 1/4) in 81lb. Coral Metallic - Stardream® are a shimmery cream color with a hint of pink. The A7 envelope size is the perfect invitation envelope and also great for mailings, holding 5 x 7 photos, invitations, announcements and more. A7 Envelopes are commonly called 5 x 7 Envelopes because they are the best envelope for 5 x 7 cards. This size invitation envelope also fits smaller A Sizes inside (A1, A2, A4, A6) as part of an invitation suite. Sealing these envelopes is made easy by a Peel & Press strip located on the inside of the back flap. Available both plain and printed for customization, branding and creative uses, starting in small quantities of 50 to large quantities of 50,000 and more.