About one tenth the size of an sd card transcends microsdhc class 10 memory card is incredibly tiny yet powerful it features the top of the line class 10 speed rating introduced by the sd card association as part of its new sd 30 specification and guarantees write speeds of 10mbs with the perfect combination of compact size high speed and generous storage space of up to 16gb the microsdhc class 10 card is tailored specifically for todays mobile devices