The ProGrade Digital 512GB CFast 2.0 Memory Card (2-Pack) is designed for high-speed photography and videography applications to work with digital cameras that are compatible with the CFast 2.0 standard, which utilizes the SATA III 6 Gb/s interface. It features read speeds of up to 550 MB/s, write speeds of up to 450 MB/s, and minimum guaranteed write speeds of 130 MB/s, thanks to the VPG-130 standard. All of this allows for the capturing of 4K, 3D, and Full HD content using Canon and a wide range of other devices.These CFast 2.0 cards have also been built with SMART technology and are able to withstand temperatures ranging from 32 to 158F while operational, or -40 to 212F while being stored. Please note that these cards have not been tested with ARRI cameras.