This collection is an incredible set of postcards. Each card is different, but all of them are visually interesting and range from funny to thoughtful to just plain cool. (My personal favorite: one that is almost completely blank, with a tiny, tiny "PSSST!" printed in the middle.) The cards themselves are oversize and made of high quality paper stock, and there is very little pre-printed on the back, just the title of the work and a small Phaidon Press logo, so there's plenty of room to write.
Finally, the price cannot be beat, considering that you can pay the same amount for 20 standard-sized postcards you have to tear out of a perforated book. Here you get 100, and they come in a sturdy plywood storage box. It really is a lovely collection, and I was having so much trouble parting with any of them that I bought another set to keep for myself!