The Angelbird 256 GB UHS-I V30 SDXC AV PRO MK2 Memory Card is a 256 GB SD card rated V30. It reads at up to 210 MB/s, writes at up to 140 MB/s, and never drops below 30 MB/s. The card is magnet resistant, shockproof, static proof, weatherproof, and X-ray proof.