Designed for the most demanding applications this verbatim sd memory card is rated at uhs i speed class 3 making it suitable for the latest 4k ultra hd video recording and high definition burst photography professional sdxc memory card ideal for very high resolution digital photography and video uhs i speed class 3 u3 suitable for 4k ultra hd video recording read speeds up to 90 mbs write speeds up to 45 mbs compact physical size 32 x 24 mm capacity 64gb colour black