ACP-EP Memory's Extreme Performance 150X SD cards are designed for photographers who need to capture large images quickly. Extreme Performance 150X SD cards feature a read speed of more than 22.5 MB second and a write speed of more than 11 MB per second so you'll be able to capture all the action quickly and securely. Extreme Performance 150X SD cards are built with the same quality features as our standard Mobile Storage SD cards, but deliver faster data transfer rates, allowing your device to reach its Extreme Performance.