rfid tags 1.mfiare chips:ultralight,1k,ntag203 2.read and writable by nfc phones ... 3.frequency:HF 13.56MHZ 4.free samples Rfid tags/ ... ISO14443A,ISO14443-4,Android:NFCA,etc)5.NFC tags: Includes NFC tags with pre-encoded content6.Content type options: ... 19*35, φ25,φ30, φ45,φ50,etcChip type options NTAG203, Mifare Ultralight (NFC Forum Type 2), Mifare Classic 1k ...