This SanDisk 64 GB Extreme PRO CompactFlash memory card is optimized for 4K video capture and delivers a minimum sustained write speed of 65MB/s with an industry-leading shot read speed of up to 160MB/s for 32GB cards and with write speeds of up to 150MB/s, it makes it easy to move even large files for storage and editing. This durable card operates in extreme conditions, so you can record rich Full HD video or snap the perfect shot in almost any climate. These cards are tested with rigorous stress, shock and vibration procedures and feature RTV silicone coating for added protection against shock and vibration.