ProGrade Digital 256GB SDXC UHS-II V90 300R Memory Card with 300MBPS Read Speed BundleProGrade Digital SDXC UHS II V90 300R 256GB Capacity, 300MB s Read and 250MB s Write Memory Card The ProGrade Digital SDXC UHS II V90 300R Memory Card features a storage capacity of up to 256GB and takes advantage of the UHS II bus to support maximum read speeds of 300 MB s and maximum write speeds of 250 MB s. This SD memory card has also been designed with the V90 Video Speed Class rating, which guarantees minimum write speeds of at least 90 MB s,