The cards are printed on luxurious 150# conservation minded, tree friendly bamboo paper and come with white envelopes. They come as either 5x5 square (requires extra postage) or as 5x7. Any image can be printed as a card. $20 for a set of 4 (same image, $5 ea) or 8 or more for $4 each (1 image per 4 pack), or 24 or more for $3 each (1 image per 4 pack). The red or green envelopes are available for a slight additional charge.