Birthday Invitation and Thank You Card Set (20 Invites and Thank You Cards) Birthday Invite and Thank You Card Set Premium 110# Classic Crest Solar White Cover Stock These are Flat Cards, not Foldovers. 20 Invites- 5" x 7" with Quality Matching Blank White Envelopes 20 Thank You Cards - 6" x 4.25" with Quality Matching Blank White Envelopes