The A2 Flat Card (4 1/4" x 5 1/2") is perfect for personal stationery and business correspondence, invitation suite inserts, casual correspondence, including letter-writing and photo-sharing and much more, these attractive flat cards are the perfect year-round card for everyday communication and much more. These notecards fit perfectly into A2 Envelopes (4 3/8" x 5 3/4") and Lee Bar envelopes.