The premier series sdhc memory cards are especially designed for digital camera users they are compliant with sd 30 specification ultra high speed 1 uhs i and backwards compatible with sd 20 specification devices this series 32gb memory card readwrite speeds are as high as 5033 mbsec providing you with higher performance high reliability and outstanding durability the premier series sdhc class 10 memory cards are the best choice for users who want to upgrade to the uhs i u1 specification