Autumn Note Cards - Fall Note Cards - Fall Thank You Cards Thank You/Note Card Set (24 flat cards and envelopes) Premium 110# Classic Crest Cover Stock & Matching Blank Bright White Envelopes. 6" x 4.25" This is a flat card, not a foldover. Designed for writing little notes & thank you's on the front of the card. Looking for foldover cards, check out our full line.