Lexar Media's Professional Secure Digital (SD) Memory Card is ideal for any photographer who demands optimal performance from both the memory card and Digital SLR camera they use. The 133x read & write speed is designed to speed up image capture times by taking advantage of a Digital SLR camera's high-speed processor. Capable of sustained write speeds of 20 MB per second, The Lexar 133x Secure Digital Memory Card is a top choice among professional photographers.