Designed for high bit depths, frame rates, and resolutions, including Full HD, 4K , and 3D video, as well as raw and continuous burst photography in DSLR and drone systems, the 256GB AV Pro MK2 UHS-II SDXC Memory Card from Angelbird features a storage capacity of 256GB and takes advantage of the UHS-II bus to support sustained read speeds of 280 MB/s and sustained write speeds of 260 MB/s, as well as maximum read speeds of 300 MB/s and maximum write speeds of 280 MB/s. This card has also been designed with the V90 Video Speed Class rating, which guarantees that write speeds won't drop below 90 MB/s.