A SanDisk 128GB Extreme PRO SDXC UHS-I memory card is designed for professional photographers and videographers, offering high-speed performance for capturing 4K UHD video and burst mode photography. It boasts read speeds of up to 200MB/s and write speeds of up to 90MB/s, with a minimum write speed of 30MB/s (V30). The card is also built to withstand harsh conditions, being temperature-proof, waterproof, shock-proof, and x-ray-proof.