I do not understand the negative reviews! Refer but almost exclusively on the size. But apparently no one had understood by those on how to fold this gray card. Instructions there is plenty on the Internet, eg YouTube. These are two simple handles and the map is smaller and much thinner and lighter than any 25-page paperback. And if one folds along with the enclosed envelope and the suspension eye over it spans short, it stays that way. So perfect! And the gray scale is absolutely correct. Those who want to have there identified any white spots, was told that she should dust off their card maybe once. In addition, this makes now absolutely nothing out! Such effects are microscopic compared to all the other tolerances are available by digital but even more so in analogue photography.
I can only say: a perfect and super small gray card that simply invites to have them always at hand. Have fun, Caro
