NFC 215 Overprint Blank White Card  is based on 13.56mhz rfid  technology and laminated with e-co friendly pvc material . Pure white pvc without any printing and overlay bothsides can reprint with thermal printer or another printing technology .NFC 215 chip blank cards have 32-bit password protection to prevent unauthorized memory operations and manufacturer programmed 7 Byte UID for each device . UID ASCII mirror for automatic serialization of NDEF messages and 50 pF input capacitance .504 bytes freely available user read or write area will better for large memory users or applications , they are widely use for smart advertisement , goods and device authentication , call request , SMS , business card ,etc . NFC 215 blank cards are provide by Shenzhen ZhiJie IOT Application Co.,Ltd and better for overprinting with their smooth and flat card finished .