What size is the postcard?

The postcard is 6 inches.

There are generally three sizes: 165mm x102mm, 148mm x100mm, and 25mm x 78mm. China's first postcard was issued in 1897 after the Qing Post Office was officially opened. In 1912, China Post stamped the words "Republic of China" on the fourth edition of Tuanlong postcards from the Qing Dynasty, which were called stamped and revalued postcards.

A postcard is a card containing information that can be posted directly. It contains text content and images. The images can be photography, paintings, etc. Generally, there is an image on the front, the recipient's zip code, address and name on the reverse, and what you want to say to the recipient in other areas.

The role of postcards:

A postcard is a card that can be posted directly without putting it in an envelope. There are many types of postcards, generally divided into postage postcards, postage-free postcards and postage-free postcards.

The front of the postcard usually has images of painting, design or photography, and the back area is used to fill in the recipient's zip code, address, name, and what you want to say to the recipient.

Postcards do not require envelopes and can be sent by simply affixing stamps. They are cheaper than ordinary letters. The disadvantage is that the content written on the postcard will be seen by others and lacks confidentiality.