Hi, Betty. Thanks for the question. The instructions recommend cutting your own cards from card stock to one of the following sizes: 4 1/4" x 5 1/2" for postcards or 5 1/2" x 8 1/2" for a regular card (you'll of course end up folding the finished card in half). I hope this helps.
~Heather
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Betty C.
Are these made to fit the 5X7 blank Cards?