ProGrade Digital 128GB UHS-II SDXC v90 Memory CardGeneral Features High performance speed tested to perform at sequential read speeds of up to 300 MB s and sequential write speeds of up to 250 MB s V90 (Video Speed Class) tested and certified to perform at a minimum sustained transfer speed of 90 MB s Required for use with the Panasonic GH5S, Panasonic AU EVA1, and Canon Cinema EOS line cameras Streamlines Motion JPEG for the Canon EOS 5D Mark IV Optimized for 6K, 5K, 4K, UHD 4K, and high bit rate