#6 envelopes are a particular style of announcement envelope with a large, pointed seal flap and diagonal seams most commonly used for greeting cards or social stationary. #6 Baronial envelopes measure 4-3/4" x 6-1/2" in size and are made with white or creme colored sulphite paper. #6 envelopes are perfect for adding a formal look to your announcement envelopes. The Supplies Shops also offers the panel cards that would fit these envelopes.