Samsung 4 GB SDHC Flash Memory Card, Brushed Metal -  MB-SS4GA/US Up to 24 MB/s read speed and 7 MB/s write speed Class 4 Speed for HD compliant storage From the world's #1 memory manufacturer since 1992 Water Proof - Can survive in sea water over 24 hours Shock Proof - can withstand being run over by a 1.6 ton vehicle Magnet Proof - Can withstand a 10K magnetic force equal to an MRI Unmatched quality of Samsung genuine memory and a 5 year warranty