ProGrade Digital 64GB SDXC UHS-II V60 Memory Card / Gold / 250 MB/sHIGHLIGHTS Max Read Speed: 250 MB s Max Write Speed: 130 MB s UHS II V60 U3 Class 10 Records 4K, UHD 4K, Full HD & 3D Video General Features Speed tested to perform at sequential read speeds of up to 250 MB s and sequential write speeds of up to 130 MB s V60 (Video Speed Class) tested and certified to perform at a minimum sustained transfer speed of 60 MB s Rigorous full card testing with serialized tracking of key components and manufacturing data