High-performance 512GB Nextorage B2 SE memory card, maximum transfer speed 1950MB/s CFexpress Type-B This is a set of two 512GB cards. Used only once in a Blackmagic camera, so they are in good condition. Used for about 3 hours. I am selling these because I need cards with a bit more capacity and faster write speeds. I will format them to exFAT before handing them over. - Brand: Nextorage - Model: B2 SE - Capacity: 512GB - Maximum Transfer Speed: 1950MB/s - Minimum Transfer Speed: 800MB/s Thank you for looking.