I am not sure what these are called all I know is it holds your cards and I have seen a lot of people make them. I used a lot of shimmer paint "116806 champagne mist" I love this stuff you can't really see how shimmery this bag is but trust me it is so pretty. The only thing I would change is use cardstock for the base instead of designer paper it just is to flimsy. So what do you think? Have a wonderful day!