The Sony 64GB M-Series is an ultra-tough SD memory card for DSLR and 4K cameras with up to 277 MB/s read speed and up to 150 MB/s write speed. It is ideal card when shooting in challenging environments. Designed for a wide range of professional photographers and videographers, as well as photo enthusiasts, they're rugged enough for the most extreme shoots. With rock solid reliability and fast speed, you have all the performance you need to catch the action. 18x More Bending Resistance An ultra-strong resin-molded design makes SF-M Series Tough specification card 18 times more resistant to bending than the SD standard. That's toughness you can rely on. IP68 Waterproof and Dustproof The card can be immersed in 16.4 feet of water for up to 72 hours, and are completely dustproof. That's total protection for shooting in all conditions. Withstands Drops of Up to 16.4 Feet Made from rock-solid materials in a one-piece mold, SF-M series Tough specification withstands drops of up to 16.4 feet. World’s Toughest One-Piece Molded Design With an innovative one-piece molded design and high-durability materials, SF-M series Tough specification cards give professionals and photo enthusiasts peace of mind and protection wherever their shoots take them. Rib-less, Write-Protect Switch-Less Design The SF-M series card gets rid of the fragile connector ribs and write-protect switch found on conventional SD cards — parts which are easy to break and can prevent writing.