1. MIFARE Classic 1K Chip 2. 13.56MHZ 3. Blue color 4. ABS Material, waterproof. 5. With metal ring. 6.can work with RC522 and PN532 7.block 0 can’t change, UID Can’t change, please contact with us if you are not sure about your chip. 8.ISO14443A MIFARE and MIFARE Classic are trademarks of NXP B.V.