Rocket & Space Thank You Cards (24 Foldover Cards and Envelopes) Rocket & Space Thank You Cards (24 cards and envelopes) Premium 100# Classic Crest Cover Stock with Quality Matching Blank Bright White Envelopes 6" x 8.5" folds to 6" x 4.25" - Cards are blank on the inside. Cards scored but ship flat for easy personalization. Designed for writing on the inside of the card.