Japanese business cards - meishi - come in two basic types: vertical and horizontal. The vertical type is mainly used only to write in Japanese. The horizontal type is convenient when the information is written in Japanese and English. The size is more or less fixed : 91mm x 55mm is the mainstream. Some meishi these days use recycled paper, while some include a photo, illustrations, etc.
When exchanging business cards, there are certain manners to follow. When receiving one, you should say Chôdai shimasu, meaning "I receive it with pleasure."
And remember that it's impolite to hide the other person's name with your finger or write anything on a meishi in front of the person who gave it to you.
