Amazon.com: LinkMore 128GB Micro SDXC Card, A1, UHS-I, U3, V30, Class 10 Compatible, Read Speed Up to 95 MB/s,Write Speed Up to 50 MB/s, SD Adapter Included : Electronics
A2-class microSD cards offer no better performance for the Raspberry Pi | Jeff Geerling
All about SanDisk's microSD cards with the new A1 speed class - HardwareZone.com.sg