High-performance 512GB CFexpress Type B memory card, achieving a read speed of 3400MB/s and a write speed of 850MB/s. - Brand: ProGrade - Storage Capacity: 512GB - Read Speed: 3400MB/s - Write Speed: 850MB/s - Standard: CFexpress Type B Thank you for viewing. ProGrade Digital CFexpress 4.0 Type B GOLD 512GB Memory Card (Maximum Read 3400MB/s, Maximum Write *Image replacement in progress Purchased on Amazon for testing with the EOS R5 Mark II. Used twice in testing, and will be put up for sale due to the return of the test equipment. The CFexpress card accessories include only the case (non-genuine). Both items are in relatively good condition without any particular issues in use, but we ask that you purchase them with the understanding that they are used items.