Zectron Digital Twin Pack 2 x 16GB Class 10 a total of 32GB of High Speed SDHC memory cards is ideal for all uses, including HD video recording High Speed Sports Photos and High Speed Multy Shots especially with high megapixel rating due to it"s very high speed. In our tests these cards show a sustained read speed above 17mb/s and a sustained write speed above 15mb/s making them faster than most other memory cards on the market. This product is brand new and comes supplied in a protective memory card case. Class 10 SD memory cards are the fastest speed available and can cope with very large files without the risk of playback lag. If you are using an SDHC memory card in a Digital Camera SD Secure Digital Card with very high megapixel rating or recording HD video we would recommend using a Class 10 card for optimal performance.