Speed
Read : up to 100MB/s with UHS-1 interface Write : up to 60MB/s with UHS-1 interface * The foregoing read & write speeds are demonstrated by internal test conducted under certain controlled conditions, and actual speeds may vary depending upon usage and other conditions. For products incompatible with UHS-I interface, the speeds may vary subject to different interface conditions
Speed Class
Grade 3, Class 10
In hindsight I should have have got 2 of these and a 128GB instead of 2x 128GB, cheaper too.