Extreme IV compact Flash is designed for serious professional photographers whodemand one of the fastest, most rugged, and most durable memory cards on the market. Professional photographers who work under less than ideal conditions expect more from a flash memory card. Extreme IV memory cards feature innovative ESP technology for the fastest speeds and highest performance. ESP stands for enhanced super-parallel processing. Simply put, it means you are getting the fastest read/write speeds available an amazing minimum 20Mbps sequential read and write speed you`ll definitely appreciate whenever you find yourself shooting and storing pictures inharsh environments, extreme temperatures or at high altitudes. Available capacity:16GB