Experience blistering speeds on a totally new level, with read speeds of up to 1750 MB/s and write speeds of up to 1000 MB/s with the Lexar 256GB Professional CFexpress Type-B Memory Card. Packed with plenty space to store smooth, raw 4k video footage and stills. General features to the 256GB professional CFexpress Type-B Memory Card include PCI Express 3.0 and NVMe protocols to help you achieve high-speed performance, reliability and durability.