ProGrade Digital SDXC UHS-II V60 Memory Card (256GB), Gold, (Secure-Digital-Cards)

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 for the high quality control
Component-level testing down to individual memory chips for improved quality
Error correction to detect and correct data write and data transfer errors