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Designed for the high demands of 4K cinemaFor professional, high-performance cameras and camcorders with CFast 2.0 technologyExtreme data transfer speeds up to 525MB/sExtreme write speeds up to 450MB/s [128GB, 256GB]Extreme write speeds up to 430MB/s [64GB]Video Performance Guarantee 130 (VPG 130) for cinema-quality 4K video Lifetime limited warranty.