These composite cards from HID iCLASS Seos feature 13.56MHz read/write contactless technology and 8k bytes of memory. The Seos technology used in these cards is known for its exceptional cryptography and unmatched data and privacy protection, making it more secure than other credential technologies. These cards do not exchange any traceable identifiers during card sessions, ensuring that data associated with a particular card cannot be revealed or duplicated.Meets ISO standards for card thickness8k bytes memory sizeMade of composite PVC/PET material