Because the length is 85.60 and the width is 53.98 mm (3.370 × 2.125 inches), its aspect ratio is close to the golden section (1.618:1).

Length 85.60, width 53.98 mm (3.370 × 2.125 inches), the radius of the card's corners is 2.88-3.48 mm, which is the most commonly used size. Standard bank cards (credit cards, debit cards, etc.) and ID cards use this size. Driver's licenses, public transportation cards, retail membership cards, U.S. passport cards, crew member certificates, and most ID cards in European countries also use the ID-1 format.

ISO 7810 is an international standard for the sizes of ID cards and bank cards. It is divided into four types: ID-1, ID-2, ID-3 and ID-000. The currently adopted version is the 2003 version.

Extended information

The appearance of an IC card is similar to a magnetic card. The difference between it and a magnetic card is that the media for data storage is different. Magnetic cards store information through changes in the magnetic field of the magnetic strip on the card, while IC cards store data information through an electrically erasable programmable read-only memory integrated circuit chip (EEPROM) embedded in the card. Therefore, compared with magnetic cards, IC cards have the following advantages:

1. Large storage capacity. The storage capacity of a magnetic card is about 200 characters; the storage capacity of an IC card varies depending on the model, from a few hundred characters to a million characters.

2. It has good security and confidentiality and is not easy to be copied. The information on the IC card can be read, modified and erased at will, but a password is required.

3. The CPU card has data processing capabilities. When exchanging data with the card reader, the data can be encrypted and decrypted to ensure the accuracy and reliability of the exchanged data; magnetic cards do not have this function.

4. It has a long service life and can be recharged repeatedly.

5. IC cards are anti-magnetic, anti-static, anti-mechanical damage and anti-chemical damage. They have a long information storage life and can be read and written tens of thousands of times.

6. IC cards can be widely used in finance, telecommunications, transportation, commerce, social security, taxation, medical care, insurance, etc., covering almost all public and public sectors.

Card Disadvantages: The disadvantage of IC cards is the high manufacturing cost.

Reference: International Organization for Standardization - ISO/IEC 7810

Reference: Baidu Encyclopedia-IC Card