1, like a bank card, a small card is more convenient to read in your wallet at any time.

2. The number of group cards varies from group to group and depends on the official configuration. There may be many kinds of cards, such as signature cards, laser border cards, triangle cards, and some albums are just one.

3. There are two kinds of small cards: official and unofficial. Official cards are mainly given away at random by purchasing albums, DVDs or other official surroundings.