The TDSi 2920-3001 Mifare 4K cards are contactless smart cards that meet ISO/IEC 14443A compliance and offer top-notch security. These cards come with a 4K-byte memory and are fully printable. With passive technology, TDSi cards offer consistent read range.Product Details:Sold in packs of 100CR80 card size (86mm x 54mm)13.56 MHz operating frequency