The A7 Flat Card (5 1/8" x 7") in 120lb. Bright White is our thickest flat card. 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 A7 Envelopes (5 1/4" x 7 1/4") and Lee Bar envelopes. Available custom printed or plain.