Colored A-6 announcement 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. A-6 envelopes measure 4-3/4" x 6-1/2" in size and are made with colored paper. A-6 announcement envelopes are perfect for that formal look when sending invitations or R.S.V.P. cards, and some are machine insertable envelopes. The Envelope Supplies Shop also offers the panel cards that would fit these envelopes.