The unit of magnetic field strength is Oersted (oe for short). Magnetic stripe cards are generally divided into 300 oe, 650 oe, 2750 oe and 4000 oe. Among them, 300 oe is a low coercivity strip, referred to as Loco, 2750 oe and 4000 oe are high coercivity strips, referred to as Hico. The high coercivity strip can store more information, and its safety factor is higher, and harder to be damaged.


The color of the magnetic stripe is generally black, silver and gold, with black being the most common. The width of the magnetic stripe is 12.7mm and 8.4mm, with 12.7mm being the most common. The magnetic stripe card is an intermediate process in the card production process: printing material → fixing → binding magnetic stripe → laminating.

Internal structure

The magnetic stripe is divided into three tracks.

There are 79 bytes in track one, numbers and characters can be input, only readable.

The second track has 40 bytes, only numbers can be input, and it can only be read.

The track 3 has 107 bytes, and only numbers can be input, which can be read and written.

Track 3 is hardly used by major global networks, and due to the narrow magnetic stripe, it usually doesn’t even exist on the card. Point-of-sale card readers almost always read track 1 or track 2, sometimes both, just in case one of the tracks is unreadable. To complete the transaction, the cardholder account information should exist on both tracks. Track 1 has a higher bit density (210 bits per inch versus 75 bits per inch), and is the only track that may contain alphabetic text, and therefore the only track that contains the cardholder’s name.


bank cards, securities, insurance: credit cards, quasi-credit cards, ATM cards, ATM cards, debit cards, transfer cards, special cards, stored-value cards, co-branded cards, commercial cards, personal cards, companies Card, Social Security Card, Social Security Card, Securities Trading Card…

Retail services: shopping cards, cash cards, membership cards, gift cards, order cards, discount cards, point cards, etc.

Social security: life and accident insurance cards, health cards

Transportation and tourism: car insurance card, travel card, room card lock, passport card, parking card, pay TV card, highway toll card, check card

Medical treatment: outpatient card, health check card, blood donation card, diagnostic chart card, blood type card, health record card, maternity card, medical record card, insurance card, prescription card

Special documents: ID card, temporary residence card, seal registration card, tax-free card…

Education: CAI card, library card, student ID, report card, tutoring card, transcript…

Entertainment: video game card, karaoke card, entertainment card, theater card

Others: factory automation card, operator card, quality control card, access control card, work card, personal record card, family security card, etc.

Precautions for use

Avoid prolonged contact with other magnetic materials