This is a Hello Kitty message card. It's the perfect size for adding a short message. The back has the same design. Each side is about 10 centimeters. It's a square. *Please note that some cards have slight color transfer from the front to the white area where you write your message. If you are concerned about this, please refrain from purchasing. For those who understand that this is a home-stored item. Hello Kitty DeAgostini HELLO KITTY Postcard DeAgostini Kitty Message card Character Grand Prize