MIFARE and MIFARE Classic are trademarks of NXP B., V. All cards are pre-programmed with a unique ID(4 Byte UID). Rfid Cards 10-Pack Blank White MIFARE Classic 1K – 13.56Mhz For Printable Rfid Cards - Printable Word Searches The wireless frequency of the MIFARE Classic 1K card is 13., 56MHz, which complies with the ISO14443A standard and contains 1K bytes of read/write memory. The surface is smooth and glossy, wear-resistant, stable, non-toxic and odorless, and hygienic and safe. Product Specifications: Chip: MIFARE Classic 1K Chip Function: Read/Write protect by password,UID can’t change,uid is not rewritable Memory: 1024 bytes Card dimensions: 85., 5 x 54mm(ISO Credit Card Size) Thickness: 0., 86mm. Buy Meikuler 13.56MHz MIFARE Classic 1K, RFID Smart Cards / M1 Cards... 【About Material】-- The MIFARE Classic 1K card is made of durable and waterproof PVC material, and the antenna adopts ultrasonic winding technology. Blank Printable RFID Cards For Access Control Nfc Tag Rfid Duplicator Meipire 13.56MHz MIFARE Classic 1K, RFID Smart Cards / M1 Pvc Card Printer Nfc Chip PVC RFID Cards 10 Pack The card has a five layer structure, which is the same size as the credit card. Each chip has a unique UID number, but the UID cannot be changed or rewritten,Default button: FF FF FF FF FF FF. Printable--These cards both sides are printable on all ISO Standard Desktop Photo ID Card Printers: Evolis, Zebra, Badgy, Fargo, Magicard, DataCard etc. But they can NOT work with HID,Salto and Assa Abloy Locks/Systems,Amiibo and Tagmo, etc.