LUXPaper A1 Invitation Envelopes, Jupiter Red Metallic, 3 5/8 x 5 1/8, 50/Pack

For those occasions calling for a dainty announcement envelope, the A1 (3 5/8" x 5 1/8") is your ideal choice – this diminutive envelope is the smallest of its kind allowed through the mail! The A1 envelope is a social and invitation-type envelope; it dimensions make it the most common-sized envelope used for RSVP and announcement purposes. Featuring an attractive square flap, the A1 fits inside all other "A" envelope sizes.