Compatible with Cfexpress 4.0, offering faster read/write speeds than standard Type A cards. I purchased six for use with my SONY camera, but I no longer need four as I was able to get Lexar Gold cards at a lower price. These are priced lower than the retail price, so please consider purchasing if you need them. They will be wrapped in bubble wrap and shipped via Nekopos (a Japanese delivery service). Nextorage Cfexpress 4.0 Type A 512GB A2SE, new and unopened.