SanDisk Extreme Pro - Flash memory card - 64 GB - Video Class V30 / UHS-I U3 / Class10 - SDXC UHS-I. Our most powerful SD UHS-I memory card yet delivers performance that elevates your creativity. With shot speeds of up to 140MB/s and UHS speed Class 3 (U3) recording, you're ready to capture stunning high-resolution, stutter-free 4K UHD video. And, because your pace doesn't let up after the shots are in, it delivers up to 200MB/s transfer speeds for a faster postproduction workflow. Plus, it's built to withstand weather, water, shocks and other less-than-ideal conditions so you can rest assured that it's good to go wherever your work takes you.