For the serious crafter, the A9 envelope (5-3/4" x 8-3/4") is a must-have in your stationery collection: its Dimensions neatly accommodate a half-folded sheet of paper for homemade card enthusiasts and letter-writers alike. A multipurpose envelope, the A9 90417-50 is also suitable for other announcement purposes and may also be used as an outer envelope for invitations. Choose from an array of exciting colors and add a bit of pizzazz to your next invitation! the A1 envelope features a traditional square flap and fits inside the A10 style envelope.