Review on Enhanced SanDisk 128GB Extreme PRO SDXC UHS-II Memory Card - Optimum Performance for C10, U3, V90 Standards - 8K, 4K, Full HD Video Capability - Reliable SD Card - Model: SDSDXDK-128G-GN4IN by Reid Rickerson

Just wanted to let potential customers know that this SD card is amazing IF your camera can accept the double row of pins on the back of the card itself. ** If you buy this card and put it in your Canon 5D Mark II, III, IV, the standard card has a minimum write speed of 30MB/s and you will not be able to fully utilize this speed **Roman number 1 = a series of 9 individual contacts , which most if not all cameras can receive. Roman numeral 2 = two rows of 17 pins that allow new DSLRs and mirrorless cameras to work.