What is your go to card size? Are you an A2 girl or maybe you prefer the full-bodied experience of an A7? Perhaps, like me, you are wondering what sizes an A2 and A7 are. Yes, I had to look them up, because, like you, I prefer to use the actual size of the card. Today, we are going to explore the different sizes and introduce you to the star of 2017, the No 10 card.