The usual used chip for contactless IC card is Mifare 1 S50, Mifare 4 S70, Mifare 1 S50 specification:
1. IK bytes EEPROM
2. Embedded antenna
3. Mifare 13.56MHz, ISO 14443A
4. Range of operation: About 2.5 to 3.9
5. Dimmension: CR80 Standard
6. Material: PVC, PET, PETG, ABS