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ProGrade Digital 256GB UHS-II microSDXC Memory Card with SD Adapter
microSD card V60 (256GB) - tested for full size SD card devices | up to 250MB/s reading, 130MB/s write by ProGrade Digital : Amazon.co.uk: Computers & Accessories
Integral 256GB UHS-II SD Card V60 Up to 260MBs Read and 100MBs Write Speed 1733X SDXC Professional High Speed Memory Card : Amazon.co.uk: Computers & Accessories
Lexar Professional micro SD Memory Card 1000x 256GB SDXC UHS-II V60 U3 Class 10 | eBay