From the manufacturer:
These do-it-yourself cards are specifically designed to use with your digital photographs. The special paper coating will result in beautiful color reproduction on any inkjet printer. Best of all, they are traditional greeting card sizes. Unlike half-fold or quarter-fold cards, they are 5" x 7" just like store-bought versions. Each pack contains ten cards and matching envelopes. Free design templates and printing instructions are available at www.strathmoreartist.com.