Cfexpress Type a Memory Card, up to 800Mb/S Read Speed & 700Mb/S Write Speed for Sony Alpha Sony FX Cameras, up to 8K RAW for Video/PhotoLarge Capacity: Pergear Professional 1TB CFexpress Type A Memory Card, specially designed for high resolution video recording, for continuous recording up to 8K RAW. Stable Performance: Pergear 1TB cfexpress type A card provides fast read speeds up to 800 MB s, write speeds up to 700 MB s. Speeds based on internal testing. Actual transfer rates and capacity may vary depending on host device, file attributes, system hardware and other factors.