The Sony 2SBS32G1C is a 2-pack of 32GB SxS-1 (G1B) memory cards that support EB streaming and memory media utility. You'll find that use with Sony's large sensor 4K camera technology allows more flexibility and creative options using 4K, 2K or HD acquisition and production. The SxS format gives you maximum read speeds of up to 440MB/s and write speed of up to 100MB/s. The 2SBS32G1C has 2x the transfer speed than that of a G1A series card.