The 2-pack of Sony 64GB SxS-1 G1C Series Memory Cards is designed for stable and reliable capture of high frame rate 4K video content. Achieving enhanced read and write speeds, these memory cards are suitable for use with Sony's large sensor 4K camera technologies, such as the XDCAM EX lineup, giving content creators more flexibility and creative options for 4K, 2K, or HD acquisition and production. With these SxS-1 memory cards, you can achieve a fast maximum read speed of up to 440 MB/s and write speed of up to 200 MB/s. Additionally, these SxS-1 memory cards can use the industry-standard PCIe platform as an interface to realize higher transfer speeds up to 8 Gb/s (1000 MB/s). These Sony SxS-1 cards offer wear-leveling (data-defect minimizing function) and data refreshing capabilities and are subjected to a series of strict quality assurance tests, including checks on recording blocks, temperature cycles, and operating environment.