Nextorage NX-B1PRO165G NX-B1PRO Series CFexpress Type B Memory Card 4K/8K Video Recording Maximum Read Speed: 1,950MB/s Maximum Write Speed: 1,900MB/s Minimum Sustained Write Speed: 1,800 MB/s Purchased in March 2023 and used with a digital camera. I will format it on a PC and send it in a case. Please understand that this is a used item before purchasing. *I am listing the same product. Please check the number at the end of the product name as it is different.