#A7 envelopes are a particular style of announcement envelope with a deep square flap and double side seam construction most commonly used with baronial cards for informal mailings, social, and commercial announcements. #A7 envelopes measure 5-1/4" x 7-1/4" in size, and are constructed from your choice of white, colored, or translucent paper. Announcement envelopes are perfect for that formal look when sending invitations or R.S.V.P. cards. There are also foil-lined #A7 envelopes for an added touch of elegance. The Supplies Shops also offers the panel cards that would fit these envelopes.