Topram 4GB SLC Compact Flash CF Card for Canon, Nikon DSLR and Industrial Applications Features SLC (Single Level Cell) IC Compact Flash, Great for Industrial Applications. Data Rention: 10 Years Read Speed: 12-15 MB/s | Write Speed: 8-10 MB/s (Individual test result may be different based on the testing environment, hardware, and the performance of the card reader). SLC Memory Chip (Data Transfer Rate : 100 -120X) High performance and reliability