The SanDisk 128GB Extreme PRO CFexpress Card Type B, with speeds that Surpass other cards high-speed, consistent recording and enhanced workflow efficiency far beyond existing SanDisk cards are the result of read speeds of up to 1700MB/s and 1400MB/s write speeds, and smooth 4K video performance The cfexpress form factor captures raw 4K video with sustainable, low-latency performance in your video recording.