Sony's SF-M series TOUGH SD cards are built to thrive in even the toughest shooting environments. They are designed for a range of pro photographers and videographers, as well as photo enthusiasts who require something a little more rugged than the standard SD. Whether you are shooting high-resolution stills, 4K video, or exploring remote landscapes through a lens, these SDs provide reliable speed and strength. With write speeds of up to 150MB/s3, these cards support longer burst shooting of high-res imagery, as well as efficient buffer memory clearing. Transfer large media files to your computer with ease, with read speeds of up to 277MB/s3. As the World's toughest SD, these cards can withstand 18x more bend than the standard SD, can be immersed in 5m of water for up to 72hrs, is completely dustproof, and can withstand drops of up to 5m. TOUGH by name, tough by nature.