The Mifare Classic 1K NXP EV1 Cards are contactless cards embedded with genuine NXP smart chip and secure read/write capabilities. These smart cards come with up to 1KB of memory capacity. Sold in packs of 100 Standard CR80 credit card size (85.60 x 53.98mm) 1KB memory capacity Operates at 13.56 MHz frequency range Individually programmed with a 4-byte NUID number
eBay