SxS cards are a type of compact flash designed by Sony and Sandisk to work on a variety of Sony cameras. SxS Pro+ cards have transfer speeds over 400mb/s, meaning they're great for 4K video.
Sony SBP-256E 256GB Pro+ media card.
Sony SBP-128D 128GB Pro+ media card.
Adapter for XQD cards allowing use in ExpressCard slots found in computers and SxS camcorders.