OEM (Unbranded) 4GB SLC Compact Flash CF Card for Canon, Nikon DSLR and Industrial Applications (Bulk Packaged). 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