These PAC cards are high-quality Ops DESFire 4k EV1 proximity cards. Ops technology helps to decrease the risk of counterfeiting. The 4K Mifare DESFire comes with a unique serial number that also helps to eliminate any threats of it being cloned. *Replaces PAC 21106* Sold in packs of 10 CR80 card size (86mm x 54mm) Fully ISO / IEC 14443 A 1-4 compliant Manufacturer part number: PAC-CD-CR-OPSC
